CBLT-333:  add ability to modify params on foreign jenkins,

and set value of "version_sgw" to number of latest 1.0.2 centos-x64
build of Sync Gateway in job

http://ci.sc.couchbase.com/job/sgw-dashboard/

Change-Id: I711d6a21716472df4f71c777202c96b99c5ec158
Reviewed-on: http://review.couchbase.org/41617
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>