Remove the amqp_rpc_single_reply_queue option from Havana

blueprint amqp-rpc-fast-reply-queue

As part of the Grizzly code review for the above blueprint (Idb09a714), the Grizzly
code base is "aware" of this feature in terms of receiving RPCs and provided with
an option for enabling it on the RPC send side. It was decided that in Havana
the option would be removed, RPCs would only be sent using the new functionality
yet awareness of prior functionality be retained for the receiving of RPCs.
This code change implements the Havana piece.

Change-Id: I5f2a8e432cf84a637c1aa813656c1cbc8db6e7eb
Merge "Remove the amqp_rpc_single_reply_queue option from Havana"