res_pjsip_config_wizard: Allow streamlined config of common pjsip scenarios

res_pjsip_config_wizard
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 * This is a new module that adds streamlined configuration capability for
   chan_pjsip.  It's targetted at users who have lots of basic configuration
   scenarios like 'phone' or 'agent' or 'trunk'.  Additional information
   can be found in the sample configuration file at
   config/samples/pjsip_wizard.conf.sample.

Tested-by: George Joseph

Review: https://reviewboard.asterisk.org/r/4190/
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Merged revisions 429592 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@429593 f38db490-d61c-443f-a65b-d21fe96a405b