Enhanced check proc and added CTDB service check

CTDB is node based and any gluster volume can be configured
to be used by CTDB. Normally when CTDB starts it will start
Samba automatically. However one can switch off SMB at any
given time. But If SMB/NFS are not running in any node,
then CTDB is also not required.

This patch checks for CTDB process and will send an
appropriate message to nagios based on its status
using 'ctdb nodestatus' command.

Currently there is no direct way to find whether CTDB
is required to run on a given node. Its because,
the CTDB volume name / CTDB volume mount path can have
any name.

It could be easy if gluster-cli comes with any
tag/set command to know whether the given volume is
for CTDB or CTDB enabled.

Change-Id: Iccb98296ebd902838acc63805bbe20cd77cdcc61
Signed-off-by: Timothy Asir <tjeyasin@redhat.com>
Reviewed-on: http://review.gluster.org/7647
Tested-by: Timothy Asir <tim.gluster@gmail.com>
Reviewed-by: Kanagaraj M <kmayilsa@redhat.com>
Reviewed-by: Sahina Bose <sabose@redhat.com>

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