MB-7885 Don't do unneeded unquotes in xdc_rep_utils.

URIs must be quoted all the way to lhttpc.

Change-Id: I1fa8f87dca28531524d7a4572daac5d4d9717fd3
Reviewed-on: http://review.couchbase.org/25250
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Chris Anderson <jchris@couchbase.com>
Reviewed-by: Junyi Xie <junyi.couchbase@gmail.com>