MB-7135: Add more stats from memcached
MB-7135: Add more stats from memcached

Change-Id: Ia8d959573df1704fe152895a6abcc8ea4b2c46ca
Reviewed-on: http://review.couchbase.org/22405
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

t3rm1n4l/ns_server,membase/ns_server,nimishzynga/ns_server,ceejatec/ns_server,mschoch/ns_server,vzasade/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,membase/ns_server,pavel-blagodov/ns_server,ceejatec/ns_server,nimishzynga/ns_server,vzasade/ns_server,nimishzynga/ns_server,ceejatec/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,mschoch/ns_server,daverigby/ns_server,membase/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,daverigby/ns_server,membase/ns_server,vzasade/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,membase/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,nimishzynga/ns_server,mschoch/ns_server,daverigby/ns_server,membase/ns_server,ceejatec/ns_server