PCBC-204: Ignore order of the hosts for persistent connections

Change-Id: Ia4a2f328e62e13b6c2b5ebcfa451f3def5578872
Reviewed-on: http://review.couchbase.org/24603
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>