Prefix stream test properties by nuxeo.test

A lot of our unit tests are driven by system properties prefixed by nuxeo.test, for instance:

• nuxeo.test.core
• nuxeo.test.directory

While doing NXP-25507, we introduce:

• nuxeo.test.stream
• nuxeo.test.workmanager

Since nuxeo-stream is a library with no dependencies on Nuxeo, its tests used system properties such as kafka or kafka.bootstrap.servers.
We want to declare only nuxeo.test.* test properties to drive whole tests such as StorageConfiguration and integration tests.
This means deprecation of both properties above, at least for Nuxeo platform.

Replacement should be done in code and integration tests mainly. We also need to find an elegant way for nuxeo-stream which doesn't deserve properties meant for Nuxeo platform.