Do not bind on remote address in GTP

This allows to communicate with multiple remote hosts. A further
improvement would be to refactor this piece of code into a function and
call it only when necessary, i.e., when we know the remote host, or want
to add one to a list of hosts.

openair3/ocp-gtpu/gtp_itf.cpp

@@ -510,7 +510,7 @@ static  int udpServerSocket(openAddr_s addr) {
 
   freeaddrinfo(servinfo); // all done with this structure
 
-  if (strlen(addr.destinationHost)>1) {
+  if (false) {
     struct addrinfo hints;
     memset(&hints,0,sizeof(hints));
     hints.ai_family=AF_UNSPEC;