autosupport: Fix bashism.

'==' is bashism (bashspecific, fails when dash is /bin/sh). Anyway, a
'case' works better there.

Originally committed in r375059 and r375060 on 2012-10-16 21:13:08.

ASTERISK-20567 #close
Reported by: Tzafrir Cohen
........

Merged revisions 424117 from http://svn.asterisk.org/svn/asterisk/branches/11
........

Merged revisions 424125 from http://svn.asterisk.org/svn/asterisk/branches/12
........

Merged revisions 424126 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@424127 65c4cc65-6c06-0410-ace0-fbb531ad65f3