This class enables us to consistently represent continuations
that are intended to be posted on a particular target handling
thread. It hols a sh_ptr to the caller so that the target thread
can re-enqueue the response on the caller after processing the
REQ/IND op.
Includes everything from sending heartbeat msgs to performing
the connection handshake. We also accept many params to
provider-params to customize and make things easier.
hayodea