CBLT-198:  export SYNCGATE_PATH=/opt/couchbase-sync-gateway/bin/sync_gateway

Change-Id: I53e7480b411176eade0e93e07fd1e3bb0682f591
Reviewed-on: http://review.couchbase.org/34208
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>