MB-18938: Map SYSLOG_CRITICAL to FATAL
MB-18938: Map SYSLOG_CRITICAL to FATAL

Change-Id: Ib535e3d7bb92f5afb1cdc70975e12d270ba4977f
Reviewed-on: http://review.couchbase.org/62096
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Will Gardner <cbd6f5d9092d9ef7d5c0510d53bba134b22c02f2@couchbase.com>

daverigby/kv_engine,owendCB/memcached,owendCB/memcached,couchbase/memcached,couchbase/memcached,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/memcached,couchbase/memcached,couchbase/memcached,daverigby/memcached,owendCB/memcached,daverigby/memcached,daverigby/memcached,owendCB/memcached