[OpenSIPS-Devel] [OpenSIPS/opensips] 775c35: is_e164(): Extend with optional '+' support

[Liviu Chircu]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 775c3597280a364d4f9c84d6bb5a2375ce9e9995
      https://github.com/OpenSIPS/opensips/commit/775c3597280a364d4f9c84d6bb5a2375ce9e9995
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2021-04-12 (Mon, 12 Apr 2021)

  Changed paths:
    A test/test_ut.c
    A test/test_ut.h
    M test/unit_tests.c
    M ut.h

  Log Message:
  -----------
  is_e164(): Extend with optional '+' support

This patch makes it so the _is_e164() check can be invoked in a way that
does not mandate the leading '+' sign.

(cherry picked from commit 35009a868cd85a63b46c1a30d25de0b0e9d48ca8)