Fix order of argument in assertEqual
Fix order of argument in assertEqual

Some tests in test_zone.py used incorrect argument
order in assertEqual(observed, expected).
The correct order expected by testtools is
assertEqual(expected, observed).

Change-Id: I60e491f5629fd6dccd25c24bfb158d3c2b0145f1
Partial-Bug: #1259292

openstack/designate,grahamhayes/designate,grahamhayes/designate,openstack/designate,muraliselva10/designate,openstack/designate,muraliselva10/designate,muraliselva10/designate,grahamhayes/designate