[reSIProcate] GSoC contributions to reSIProcate

[Cătălin Constantin Ușurelu <catalin.usurelu5@xxxxxxxxx>]

Hi,

My name is Catalin Constantin Usurelu and I'm a GSoC participant. For my project I am also contributing to reSIProcate.

I will commit all my changes to a branch[0].

What I have done for now:

- Fix a problem observed by Daniel (http://list.resiprocate.org/archive/repro-devel/msg00448.html) . Basically, when binding the CommandServer port failed, the CommandServer was still being used because no check was done to prevent its use.

- When both IPv6 and IPv4 here activated for repro, the default was to bind to all adapters(IPv4 and IPv6) but because of  IPv4-to-IPv6 mapping, a port in use error appeared. I had to enable the IPV6_V6ONLY socket option (only on Linux for the moment, on Windows for example it is activated by default).

- Added support for binding the WebAdmin and CommandServer listeners to specific IP addresses.

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[0]https://svn.resiprocate.org/rep/resiprocate/branches/b-gsoc-2013