UserManager: Fix unit test cases

User_mgr and ldap_mapper testcases are failing with D-bus errors.
This commit fixes both testcases by using mocked sdbus.

Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>
Change-Id: I3fcabeb1781c938affa11a1370b107d628242374
3 files changed