CBLT-255:  fix up paths to zip_jars.sh

Change-Id: Iec0c6ea162d6e7b5948dea99d95e08c06d9bc5ed
Reviewed-on: http://review.couchbase.org/40955
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>