Don't time out on delete_bucket
Don't time out on delete_bucket

This makes it so ns_memcached will block until the bucket is written
to disk on shutdown.

Change-Id: Ibc7d639eb72384ac24516362bf6a39387c1fe2b3
Reviewed-on: http://review.northscale.com/3021
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

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