MB-19410: tweak hard OOM alert message
MB-19410: tweak hard OOM alert message

Change-Id: I73d660edaaba00de922130f0c02d3c6b80f4e8c8
Reviewed-on: http://review.couchbase.org/77503
Tested-by: Dave Finlay <7b10a9ed9f70e64c30b07607a671ae61c33f14c8@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server