JIRA: https://jira.spring.io/browse/INT-3996
One of the query provider implementations was missing. To avoid a maintenance
nightmare, simply reference the interface's javadoc which lists all known
implementations.
* Simple `JdbcChannelMessageStore` JavaDocs polishing
* Add `LogAdjustingTestSupport` to the `StompIntegrationTests` to trace failures in the future.
* Also change the test `Start/Stop` messages to the `WARN` level in the `LogAdjustingTestSupport`, because `DEBUG` doesn't work everywhere.
Maybe some logging systems mix misconfiguration, like we have in the WebSocket modules with the Embedded Tomcat
9e092d44f7