MB-5060 Remove bucket from remaining_buckets upon deletion.
MB-5060 Remove bucket from remaining_buckets upon deletion.

If user request bucket deletion when janitor run is in progress, we
shut janitor down but we used to keep remaining_bucket list intact. It
means that in certain circumstances subsequent janitor run would try
to cleanup the bucket that had just been deleted.

Change-Id: Ic5a12b4a320ea7fe547d0e54ee0d8c695848e06b
Reviewed-on: http://review.couchbase.org/14957
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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