Add tests for enabled attribute ignored

There were no tests that showed what happened when the enabled
attribute is ignored for the LDAP backend for various entities.

The tests show that if the client tries to disable the entity the
entity actually remains enabled.

Change-Id: I48608f772456ade05318170d3615920d664d7dd2
Partial-Bug: #1241134
Merge "Add tests for enabled attribute ignored"