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Steps to reproduce:

1. Create a user with a tenant.
   1. Navigate to page Object Gateway >> Users >> Create.
   2. Fill in all required fields. But for the Username field, we need to input content like <tenant>$<user>.
   3. A user named <user> will be created within tenant <tenant>. Maybe we can refine the user creation form to allow specifying tenant more explicitly.
      
   4. Another way is to create user via radosgw-admin. See https://docs.ceph.com/docs/master/radosgw/multitenancy/#examples
2. Create a bucket and change bucket owner to the user just created
   1. Navigate to page Object Gateway >> Buckets >> Create.
   2. Create a bucket and select the user we just created as owner (user names appears in the form <tenant>$<user>)
      
   3. After submitting the request, Object Gateway >> Buckets page fails to load the bucket list table.
      

• If we create a bucket and set its owner to a user within a tenant, listing the bucket via admin OPs API or radosgw-admin command returns bucket name prefixed with tenant name. Here are some information get from CLI.
  

  # bin/radosgw-admin user list
  2019-08-21T07:42:33.555+0000 7f76026d68c0 -1 WARNING: all dangerous and experimental features are enabled.
  2019-08-21T07:42:33.555+0000 7f76026d68c0 -1 WARNING: all dangerous and experimental features are enabled.
  2019-08-21T07:42:33.555+0000 7f76026d68c0 -1 WARNING: all dangerous and experimental features are enabled.
  [
      "56789abcdef0123456789abcdef0123456789abcdef0123456789abcdef01234",
      "testx$9876543210abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
      "foo$bar",
      "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
      "test",
      "testid",
      "dev" 
  ]
  
  # bin/radosgw-admin bucket list
  [
      "foo/test-bucket" 
  ]
  

• When navigating to Object Gateway >> Buckets, frontend retrieves bucket list first and retrieves information for every bucket.
• The bucket's name we created is foo/test-bucket, which makes frontend issues GET requests to api/rgw/bucket/foo/test-bucket, which is an unknown path in cherrypy.
• This should be fixed by escaping bucket name in frontend.