Update generic routes for administrative layer
Update the current routes to generic ones:
1. `/admin` — entry point;
2. `/admin/auth` — basic authentificator;
3. `/admin/session/validate` — validate a session;
4. `/admin/session/extend` — extend a validated session to `sess_timeout`
5. `/admin/session/close` — close a session.
Sample config:
```javascript
{
"routing": {
"label": "Routing settings",
"group": {
"routes": {
"login": {
"label": "Default route",
"route": {
"path": "/admin",
"hdlr": {
"default": "browse",
"/api": "browse_api"
}
}
},
"authentication": {
"label": "Authenticate a consumer route",
"route": {
"path": "/admin/auth",
"hdlr": {
"/api": "auth_api"
}
}
},
"validate": {
"label": "Validate a session route",
"route": {
"path": "/admin/session/validate",
"hdlr": {
"/api": "validate_session_api"
}
}
},
"extend": {
"label": "Extend a validated session route",
"route": {
"path": "/admin/session/extend",
"hdlr": {
"/api": "extend_session_api"
}
}
},
"close": {
"label": "Close a validated session route",
"route": {
"path": "/admin/session/close",
"hdlr": {
"/api": "close_session_api"
}
}
}
}
}
}
}
```
issue