[OpenSIPS-Devel] [OpenSIPS/opensips] 6219be: registrar lookup(): Add a new retcode + unit tests

[Liviu Chircu]

  Branch: refs/heads/feature/rfc-8599-sip-pn
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 6219beb9f86fe470f4a2c58248afab3b99fff06d
      https://github.com/OpenSIPS/opensips/commit/6219beb9f86fe470f4a2c58248afab3b99fff06d
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2020-04-16 (Thu, 16 Apr 2020)

  Changed paths:
    M lib/reg/sip_msg.h
    M modules/mid_registrar/lookup.c
    M modules/registrar/doc/registrar_admin.xml
    M modules/registrar/lookup.c
    M modules/registrar/test/test.c
    M ut.h

  Log Message:
  -----------
  registrar lookup(): Add a new retcode + unit tests

The new return code "2" of lookup() is needed when all found contacts
are PN-enabled.  In this case, script developers must NOT call t_relay()
afterwards.