Fill REST api hostname for Ketama distribution
Fill REST api hostname for Ketama distribution

Change-Id: Ia56c444340252e4bba6d4b6ca4e3299f9f2cb035
Reviewed-on: http://review.couchbase.org/12938
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

couchbase/libvbucket,membase/libvbucket,zbase/libvbucket,zbase/libvbucket,zbase/libvbucket