chan_sip: Increase some scratch buffer sizes dealing with caller id.

chan_sip: Increase some scratch buffer sizes dealing with caller id.

* Eliminated an unnecessary initialization in check_user_full().

(closes issue ASTERISK-22477)
Reported by: Michael Shepelev
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Merged revisions 400013 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 400014 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 400015 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@400016 65c4cc65-6c06-0410-ace0-fbb531ad65f3