CBIT-532: Changes to parametize script to allow branch, version

Change-Id: I30abdd996acd117d66871a122d3378f3059ebe10
Reviewed-on: http://review.couchbase.org/37641
Reviewed-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Tested-by: Eric Limare <eric.limare@couchbase.com>