Improve support for re-opening sockets when network errors detected.
Corrected update SQL for Node/IP mapping updates.
Fixes to node registration to handle update versus insert, and improved
logging when errors detected.
Improved message when service handlers cannot be found. Now includes the
name of the class reporting the error -- this is important to know if it
is a client dispatcher (where such errors are usually much less
important) versus the Fabric Manager dispatcher.