[sr-dev] git:lazedo/4.2.1: Merge branch '4.2' into lazedo/4.2.1

[Luis Azedo]

Module: sip-router
Branch: lazedo/4.2.1
Commit: 543e5dd2e6a9e266e3edd8c2389945528aa7200a
URL:    http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=543e5dd2e6a9e266e3edd8c2389945528aa7200a

Author: Luis Azedo <luis at 2600hz.com>
Committer: Luis Azedo <luis at 2600hz.com>
Date:   Sun Dec  7 11:55:45 2014 +0000

Merge branch '4.2' into lazedo/4.2.1

* 4.2:
  exec: use proper header field iterator to print env variables
  core: keep the password only if the user part is set
  acc: free extra attributes for db, radius and diameter
  modules/pua: do not override send_publish return value at error
  nat_traversal: use dedicated function for testing via address against source ip
  nathelper: use dedicated function for testing via address against source ip
  core: dedicated function to check Via address with source ip

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