Add leading and trailing backslashes

Add leading and trailing backslashes

A couple of unit tests did not have have leading or trailing backslashes when
setting their test category resulting in a warning message being displayed.
Added the backslash where needed.
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Merged revisions 362680 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 362681 from http://svn.asterisk.org/svn/asterisk/branches/10

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@362682 65c4cc65-6c06-0410-ace0-fbb531ad65f3