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
Merge "Fix calls for proboscis methods"