Fix for sockperf seg-fault when using multicast and unicast udp on the same port in a feed file. The problematic feedfile: U:1.1.1.16:11111 U:224.4.4.4:11111
Fix for sockperf seg-fault when using multicast and unicast udp on the same port in a feed file.
The problematic feedfile:
U:1.1.1.16:11111
U:224.4.4.4:11111

sockperf first add the UC socket and does not allocate memory for multicast groups, then it try to 
add the MC group to the same socket (due to equal port), but without taking care of memory allocation.

shekkbuilder/sockperf,shekkbuilder/sockperf,shekkbuilder/sockperf,shekkbuilder/sockperf