get rid of myip in sgw_test_info.sh

Change-Id: I3ea7bae7bd10738f78bfca67d58215c1b7386aa7
Reviewed-on: http://review.couchbase.org/37007
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>