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Escape commas in keys and values, when keys and values are enumerated by commas.

Review: https://reviewboard.asterisk.org/r/1433
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Merged revisions 337325 from https://origsvn.digium.com/svn/asterisk/branches/1.8
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Merged revisions 337342 from https://origsvn.digium.com/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@337343 65c4cc65-6c06-0410-ace0-fbb531ad65f3