LU-8226 tests: Change check_catastrophe() to check_node_health()

LU-8226 tests: Change check_catastrophe() to check_node_health()

Change check_catastrophe() to check_node_health() and take care of
following,
    - whether the remote node was running,
    - whether there was an LBUG/LASSERT

and print a proper error message in both case for particular
node.

Seagate-bug-id: MRP-3380
Change-Id: Ia42600ab6e6ee3925d3bda9ac9561149d60d8d72
Signed-off-by: Parinay Kondekar <parinay.kondekar@seagate.com>
Reviewed-on: http://review.whamcloud.com/20539
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>