The default value for mohinterpret is the empty string, so when resetting to

default values don't explicitly set the value to "default."
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Merged revisions 357811 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 357812 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@357813 65c4cc65-6c06-0410-ace0-fbb531ad65f3