[SR-Users] Patch to support symmetric UDP socket in mi_datagram

Hi, After wasting most of the day trying to make mi_datagram over UDP socket work. I eventually realize that it does asymmetric UDP communication, which creates a lot of trouble for writing a useful MI script using PERL or Python etc. Anyhow, i go through the module code and was able to write a patch for symmetric UDP communication using mi_datagram. I have tested the patch using both Kamailio 4.1 and trunk branches and it seems to compile and run flawlessly. I am attaching here with this patch for Kamailio community. It would be great if Kamailio developers would review and commit this patch to source trunk. Thank you.