INT-3096 TCP Allow Stacking Cache and Failover

Support nesting the fail over and caching client connection
factories.

The TcpListener chain was not set up properly; this prevented
caching Failover connections, or Failover cached connections.

Each nested interceptor needs the next outer interceptor set
up as its listener, so the underlying connection calls
onMessage() all the way up to the ultimate listener (adapter
or gateway).

Fix the Listener hierarchy; add tests for caching failover
connections and failing over cached connections.

Don't overrwrite the actual connection id if it has already
been set up by a lower level wrapper.