[OpenSIPS-Devel] [OpenSIPS/opensips] a13d6d: add support for '*' keyword for listeners

[Razvan Crainea]

  Branch: refs/heads/2.3
  Home:   https://github.com/OpenSIPS/opensips
  Commit: a13d6d76b2345f78cf5996082c06a2a9ba293bd3
      https://github.com/OpenSIPS/opensips/commit/a13d6d76b2345f78cf5996082c06a2a9ba293bd3
  Author: Razvan Crainea <razvan at opensips.org>
  Date:   2017-12-06 (Wed, 06 Dec 2017)

  Changed paths:
    M cfg.y

  Log Message:
  -----------
  add support for '*' keyword for listeners

Using this feature you can specify opensips it should listen for a
specific protocol on all interfaces. The syntax is:
```
listen = udp:*:5060
```

(cherry picked from commit 4b39b578d430d49301a7d3fcf2f13d1bcc52a962)