tree de0ce9b3ac2066a457156387c93f33d1c83c74e1
parent 516112e38be49116528998dd8db8ae5056a530e2
author armando-migliaccio <armamig@gmail.com> 1424656517 -0800
committer Matthew Treinish <mtreinish@kortar.org> 1424793303 +0000

Fix AttributeError on testtools missing MismatchError

It sounds like MismatchError is borderline between part
of a public interface of testtools, and may or may not be
available depending of testtoools version.

Get rid of the nonsense altogether. The helper method was
wrong in that it shouldn't have been asserting a result if an
expected condition was not that. This commit removes the
broken helper method in favor of directly calling the 
get_dns_servers method where necessary.

Closes-bug: #1424482

Change-Id: Iaa611f833f70a528f38fe8cc9d9add0047bf51e1