Fix calls for proboscis methods
Fix calls for proboscis methods

Reasons:
 - Detected use of `fail` and `assert_equal` method
   from proboscis package without importing.

Changes:
 - fixing calls for `fail` and `assert_equal` methods.

Change-Id: I3c8c53712c275fdd5eda28029f9377f83884635c
Closes-Bug: #1325950

openstack/trove,zhujzhuo/openstack-trove,openstack/trove,redhat-openstack/trove,redhat-openstack/trove,fabian4/trove,fabian4/trove,mmasaki/trove,fabian4/trove,redhat-openstack/trove,changsimon/trove,zhangg/trove,mmasaki/trove,cp16net/trove,cp16net/trove,cp16net/trove,hplustree/trove,changsimon/trove,changsimon/trove,mmasaki/trove,hplustree/trove,zhujzhuo/openstack-trove,zhangg/trove,zhujzhuo/openstack-trove