SLING-2788 - split repository name test to make it easier to find out which implementation was used in a test run - only one of the OakRepositoryNameTest and JackrabbitRepositoryNameTest test classes will be executed in a given test run (or JUnitCategoriesTest will fail)

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1539292 13f79535-47bb-0310-9956-ffa450edef68