Currently, three different exchanges are used: `datawarehouse.kcidb`, `herder` and `webhooks` [1]. AC: - [x] consistent publishing: proper routing keys and message-type header everywhere, with routing keys corresponding to future publish exchange names (cki.datawarehouse, cki.herder) - [x] route dw and herder exchanges to webhooks exchange (as already done for fedmsg/irc/umb), and rename dw publish exchange to cki.exchange.datawarehouse to be consistent with routing keys - [ ] switch listeners to webhooks exchange with proper routing keys and message-type checks - [x] update documentation [1] https://cki-project.org/docs/background/infrastructure/messaging/ Jira: [CKI-7221](https://issues.redhat.com/browse/CKI-7221)