bp: don't insist on unique name for ns_memcached_sup instances
bp: don't insist on unique name for ns_memcached_sup instances

Which breaks multiple buckets because every bucket creates its own
instance of ns_memcached_sup which all try to register under same name
and fail.

Change-Id: I4cff4d6db4706ae4b529b832916dc7cff5d3918d
Orig-Reviewed-on: http://review.couchbase.org/42433
Reviewed-on: http://review.couchbase.org/42995
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

membase/ns_server,nimishzynga/ns_server,mschoch/ns_server,ceejatec/ns_server,membase/ns_server,mschoch/ns_server,mschoch/ns_server,nimishzynga/ns_server,mschoch/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,ceejatec/ns_server,mschoch/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server,nimishzynga/ns_server,ceejatec/ns_server,mschoch/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,nimishzynga/ns_server,ceejatec/ns_server