This duplicates the check performed for ceph status and specialises it for
radosgw-admin sync status instead.
The config options available are:
- nagios_rgw_zones: this is which zones are expected to be connected
- nagios_rgw_additional_checks: this is equivalent to nagios_additional_checks
and allows for a configurable set of strings to grep for as critical alerts.
Change-Id: Ideb35587693feaf1cc0736e981005332e91ca861
8d7c1060aa