[swift][ceph][radosgw] Can not create container with the same name in different tenants

Detailed bug description:
We are using ceph and enable rgw we create two user and assign each one of them to a tenant with role _member_ as following
user1 -> tenent1
user2 -> tenent2

when we create a container from horizon named test1 on tenent1 we will not be able to create a container named test1 on tenent2

Steps to reproduce:
 create container (public or private) on teanet with name and create another container on another tenant with the same name
Expected results:
 both containers created
Actual result:
 first container created but the second did not with error message “Error: A container with the name "test" already exists.” if the created container public and “ Error: Unable to create container.” if the created container private
Reproducibility:
 we are able to reproduce
Workaround:
 No workaround found yet
Impact:
 Different tenants can’t use the same containers names
Description of the environment:
 Operation system: Ubuntu 14.04
 Fuel version 8.0.0
ceph version 0.94.5

[root@fuel ~]# more /etc/nailgun/version.yaml
VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "8.0"
  api: "1.0"
  build_number: "570"
  build_id: "570"
  fuel-nailgun_sha: "558ca91a854cf29e395940c232911ffb851899c1"
  python-fuelclient_sha: "4f234669cfe88a9406f4e438b1e1f74f1ef484a5"
  fuel-agent_sha: "658be72c4b42d3e1436b86ac4567ab914bfb451b"
  fuel-nailgun-agent_sha: "b2bb466fd5bd92da614cdbd819d6999c510ebfb1"
  astute_sha: "b81577a5b7857c4be8748492bae1dec2fa89b446"
  fuel-library_sha: "c2a335b5b725f1b994f78d4c78723d29fa44685a"
  fuel-ostf_sha: "3bc76a63a9e7d195ff34eadc29552f4235fa6c52"
  fuel-mirror_sha: "fb45b80d7bee5899d931f926e5c9512e2b442749"
  fuelmenu_sha: "78ffc73065a9674b707c081d128cb7eea611474f"
  shotgun_sha: "63645dea384a37dde5c01d4f8905566978e5d906"
  network-checker_sha: "a43cf96cd9532f10794dce736350bf5bed350e9d"
  fuel-upgrade_sha: "616a7490ec7199f69759e97e42f9b97dfc87e85b"
  fuelmain_sha: "d605bcbabf315382d56d0ce8143458be67c53434"