server.servlet.contextPath set

As Spring Boot 1.4.x and older doesn't use the vendor content-type for
the actuator endpoints, we also need to consider application/json
responses for the legacy conversion

fixes #749

The to/from statuses were previously inverted.
Test message contents in tests for MicrosoftTeamsNotifier.doNotify().

The caches.size metric is not available for every cache implementation.
If the metric is not available the ui should still show hits and misses.
This commit ignores errors for the cache size and will do no further
requests for this metric after an error occurred.

fixes #756

Setting a loglevel for logger names with spaces currently fails because
the servlet.InstanceProxyController messes with the encoding. With this
commit the path is correctly encoded before being forwarded.

fixes #755

fixes #753

fixes #738

also fix table styling in httptraces, auditevents and sessions

In order to do a relaease not waiting for Spring Cloud
Finchley.REALEASE move all depedent stuff into a seperate module which
can be excluded during build

fixes #728