nvmeofgw: beacon diff implementation in the monitor and in the MonClient.

nvmeofgw: beacon diff implementation in the monitor and in the MonClient.

     -monclient encodes subsystems by beacon-diff rules if BEACON_DIFF
      bit is enabled by quorum
     -monitor processes beacons by beacon-diff new schema
     -monitor detects sequence out of order(ooo) condition and handles it
     -in case ooo detected monitor send ack to the gw with the expected correct sequence
     -monitor skips failovers for some interval when ooo detected
     -monitor ignores all becons with incorrect sequences until gw sends expected one
     -coding upgrade rules

  Signed-off-by: Leonid Chernin <leonidc@il.ibm.com>
Fixes: https://tracker.ceph.com/issues/72394
(cherry picked from commit 3555a28e45c5b44289f12abe2fc843e21c7ebf87)

Conflicts:
  src/mon/NVMeofGwMon.h
  check_beacon_timeout() was in tentacle, and in main, but wasn't a part of this commit.
  Conflict resolution - this should be there because it is required for fast failover

  src/test/CMakeLists.txt
  the problem was that there is an empty line at the end of the file in main, but not in tentacle