TCPPING/TCPGOSSIP not configurable via outbound-socket-binding capability references

TCPPING and TCPGOSSIP are notoriously awkward to configure and manage. This can be addressed by using capability references to outbound-socket-bindings.
e.g.
<sockets-protocol type="TCPPING" outbound-socket-bindings="binding1 binding2"/>

Additionally, TCPPING port_range can be auto-configured from the port_range specified by the transport.