TestSlashInName: don't create 2 char long containers
TestSlashInName: don't create 2 char long containers

Signed-off-by: Yehuda Sadeh <48638f9c2a62c4fd20be28d0bdad68f5cd041402@inktank.com>

ceph/swift,SUSE/swift,Intel-bigdata/swift,ceph/swift,Intel-bigdata/swift,SUSE/swift