actually delete buckets when node is failed over
actually delete buckets when node is failed over

Not just shutdown ns_memcached. Right now we shutdown ns_memcached,
delete bucket without force option but leave data files. Those files
are deleted when node is finally ejected, but if user does add-back
instead it leads to lengthy warmup of those data files. Essentially
not allowing rebalance without good reason.

Change-Id: Iba2a82e35471b496e04ec2c433a3868a4f886176
Reviewed-on: http://review.couchbase.org/14180
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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