Friendly iOS notification missing config errors
After:
```
2017-07-20T22:46:07.891Z - warn: ios push notification gateway (Prod) missing config, apn:certProd:undefined apn:keyProd:undefined
{ category: 'push-notifications' }
2017-07-20T22:46:07.899Z - warn: ios push notification gateway (Dev) missing config, apn:certDev:undefined apn:keyDev:undefined
{ category: 'push-notifications' }
2017-07-20T22:46:08.011Z - warn: ios push notification feedback (Dev) missing config, apn:certDev:undefined apn:keyDev:undefined
{ category: 'push-notifications' }
```
Before:
```
2017-07-20T22:49:45.780Z - error: ios push notification feedback (Dev) experienced an error
{ error: 'ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'',
category: 'push-notifications' }
2017-07-20T22:49:45.790Z - error: No error reporting is enabled so just logging to logger:
{ exception:
{ message: 'ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'',
stack: 'Error: ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'\n at Error (native)\nFrom previous event:\n
at resolveCredential (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\credentials\\resolve.js:17:31)\n at loadCredentials (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\credentials\\load.js:14:20)\n at Feedback.loadCredentials (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:121:29)\n at Feedback.createSocket (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:151:7)\n at Feedback.request (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:278:7)\n at Feedback.start (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:270:7)\n at new Feedback (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:88:7)\n at createFeedbackEmitterForEnv (C:/Users/some-user/Documents/GitLab/webapp/modules/push-gateways/lib/ios/ios-notification-gateway.js:120:20)\n at Object.createFeedbackEmitter (C:/Users/some-user/Documents/GitLab/webapp/modules/push-gateways/lib/ios/ios-notification-gateway.js:163:14)\n at Object.exports.install (C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/apn-feedback-listener.js:14:36)\n at C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/index.js:23:21\n at Array.forEach (native)\n
at Object.exports.install (C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/index.js:22:19)\n at Object.<anonymous> (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\server\\web.js:26:30)\n at require (internal/module.js:20:19)\n at Object.<anonymous> (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\web.js:7:1)\n at run (bootstrap_node.js:352:7)\n at startup (bootstrap_node.js:144:9)\n at bootstrap_node.js:467:3',
name: 'Error' },
meta:
{ errorString: 'Error: ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'',
apnEnv: 'Dev' },
tags:
{ host: 'some-pc',
module: 'ios-notification-gateway',
job: 'web' } }
2017-07-20T22:49:45.794Z - error: ios push notification feedback (Dev) experienced a feedbackError
{ error: 'ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'',
category: 'push-notifications' }
2017-07-20T22:49:45.795Z - error: No error reporting is enabled so just logging to logger:
{ exception:
{ message: 'ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'',
stack: 'Error: ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'\n at Error (native)\nFrom previous event:\n
at resolveCredential (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\credentials\\resolve.js:17:31)\n at loadCredentials (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\credentials\\load.js:14:20)\n at Feedback.loadCredentials (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:121:29)\n at Feedback.createSocket (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:151:7)\n at Feedback.request (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:278:7)\n at Feedback.start (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:270:7)\n at new Feedback (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:88:7)\n at createFeedbackEmitterForEnv (C:/Users/some-user/Documents/GitLab/webapp/modules/push-gateways/lib/ios/ios-notification-gateway.js:120:20)\n at Object.createFeedbackEmitter (C:/Users/some-user/Documents/GitLab/webapp/modules/push-gateways/lib/ios/ios-notification-gateway.js:163:14)\n at Object.exports.install (C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/apn-feedback-listener.js:14:36)\n at C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/index.js:23:21\n at Array.forEach (native)\n
at Object.exports.install (C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/index.js:22:19)\n at Object.<anonymous> (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\server\\web.js:26:30)\n at require (internal/module.js:20:19)\n at Object.<anonymous> (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\web.js:7:1)\n at run (bootstrap_node.js:352:7)\n at startup (bootstrap_node.js:144:9)\n at bootstrap_node.js:467:3\nFrom previous event:\n at Feedback.createSocket (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:150:30)\n at Feedback.request (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:278:7)\n at Feedback.start (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:270:7)\n at new Feedback (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\node_modules\\apn\\lib\\feedback.js:88:7)\n at createFeedbackEmitterForEnv (C:/Users/some-user/Documents/GitLab/webapp/modules/push-gateways/lib/ios/ios-notification-gateway.js:120:20)\n at Object.createFeedbackEmitter (C:/Users/some-user/Documents/GitLab/webapp/modules/push-gateways/lib/ios/ios-notification-gateway.js:163:14)\n at Object.exports.install (C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/apn-feedback-listener.js:14:36)\n at C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/index.js:23:21\n at Array.forEach (native)\n at Object.exports.install (C:/Users/some-user/Documents/GitLab/webapp/server/event-listeners/index.js:22:19)\n at Object.<anonymous> (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\server\\web.js:26:30)\n at require (internal/module.js:20:19)\n at Object.<anonymous> (C:\\Users\\some-user\\Documents\\GitLab\\webapp\\web.js:7:1)\n at run (bootstrap_node.js:352:7)\n at startup (bootstrap_node.js:144:9)\n at bootstrap_node.js:467:3',
name: 'Error' },
meta:
{ errorString: 'Error: ENOENT: no such file or directory, open \'C:\\Users\\some-user\\Documents\\GitLab\\webapp\\cert.pem\'',
apnEnv: 'Dev' },
tags:
{ host: 'some-pc',
module: 'ios-notification-gateway',
job: 'web' } }
```