asterixdb

On HB from NC, respond with an ACK.  In the event a heartbeat is

rec'd from an unknown NC, attempt to respond with an exception to

give the chance for the NC to handle.  On receipt of an exception

on ACK indicating the node is not known to the CC, force a reconnect.

Change-Id: I7be64fd8c550a697729c7fcf8783beae95043cd7

Reviewed-on: https://asterix-gerrit.ics.uci.edu/2881

Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Reviewed-by: Murtadha Hubail <mhubail@apache.org>

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