Add scripts/sgw_test_info.sh and fix the sleep_time problem

Change-Id: I6ba332899672ab5c67c8db056b07e9f2382f2fbf
Reviewed-on: http://review.couchbase.org/36807
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>