Fixed bug where an invalid option warning would be emitted when using deprecated hosts option.

Change-Id: I6a1a099289dfc564c456ac27ca292f37b7ad9623
Reviewed-on: http://review.couchbase.org/28703
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Brett Lawson <brett19@gmail.com>