AST-2016-004: Fix crash on REGISTER with long URI.

Due to some ignored return values, Asterisk could crash if processing an
incoming REGISTER whose contact URI was above a certain length.

ASTERISK-25707 #close
Reported by George Joseph

Patches:
    0001-res_pjsip-Validate-that-URIs-don-t-exceed-pjproject-.patch

AST-2016-004

Change-Id: I3ea7cee16f29c8088794de3085ca7523c1c4833d