res_pjsip: Backport missing commits for user_eq_phone

This backports the following from trunk, which were missed:

r427257 | file | 2014-11-04 16:31:16 -0600 (Tue, 04 Nov 2014) | 2 lines

res_pjsip: Allow + at the beginning of a phone number when user_eq_phone is enabled.

r427259 | file | 2014-11-04 16:51:32 -0600 (Tue, 04 Nov 2014) | 2 lines

res_pjsip: Apply the 'user_eq_phone' setting to the To header as well.

It also adds the Alembic script for the option.



git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@430092 f38db490-d61c-443f-a65b-d21fe96a405b