Author: Christos Tsantilas <chtsanti@users.sourceforge.net>, Amos Jeffries <squid3...

Author: Christos Tsantilas <chtsanti@users.sourceforge.net>, Amos Jeffries <squid3@treenet.co.nz>
Bug 3264: Segmentation Fault in src/ipc/Strand.cc(54) receive: 3

The SharedListenResponse because copied using memcpy function (TypedMsgHdr.cc
file, 154 line, Ipc::TypedMsgHdr::getRaw method) can not have complex class
members like the SharedListenResponse::conn which is a RefCounted object.

This patch
 - Remove the SharedListenResponse::conn member and replaced with a
   single SharedListenResponse::fd (integer filedescriptor) member.

 - Does not create a new Comm::Connection object for listening sockets
   inside IPC code , but use the Comm:Connection object created while
   initializing the listening socket and passed to the Ipc::StartListening
   method.