MB-2716 Allow anonymous access to /pools and /pools/default
MB-2716 Allow anonymous access to /pools and /pools/default

I'd blocked this while working on some other auth stuff because I
didn't realize they were supposed to be open. Note that anonymous auth
is only allowed if you have a bucket with an empty password, such as
default.

Change-Id: Id9520459717c2214be955bcc9ae671bd4b3b88eb
Reviewed-on: http://review.membase.org/3833
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

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