[Buildbot] #2521: Replace deprecated method unittest.TestCase.assert_() with newer assertEqual/NotEqual

[Buildbot trac]

#2521: Replace deprecated method unittest.TestCase.assert_() with newer
assertEqual/NotEqual
-------------------------+------------------------
Reporter:  rutsky        |       Owner:  ewong
    Type:  enhancement   |      Status:  closed
Priority:  major         |   Milestone:  undecided
 Version:  0.8.7p1       |  Resolution:  fixed
Keywords:  tests simple  |
-------------------------+------------------------
Changes (by rutsky):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 Looks like this was fixed some time ago.
 Plus [https://github.com/buildbot/buildbot/pull/2591 this PR] fixes other
 deprecations.

 This is all in master, *not* in eight branch.

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Ticket URL: <http://trac.buildbot.net/ticket/2521#comment:10>
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