engine,webadmin: various coverity issues

- Fixed various noted coverity issues (CIDs):
  - 1062151 (Removed unused field from test)
  - 1201855 (Missing call to superclass)
  - 1201865 (Removed duplicate expression in test)
  - 1201860 (Removed entity from object that is already
             defined in superclass)
  - 1201857 (Missing call to superclass)

Change-Id: Ib3833e8420ab7040c02600f97e439c21487f2466
Signed-off-by: Alexander Wels <awels@redhat.com>