core: Remove infinispan mocking from bll tests

This mocking seems to be useless. Perhaps it had some use when it was
introduced, but its obvious it plays no function now.

Change-Id: I0b7cc1a51971fce44316e9a7c3d14e686b84ec43
Signed-off-by: Allon Mureinik <amureini@redhat.com>