Return configured container names

[dmorawetz]

When listing available containers, the name of the folder on disk was returned, instead of the configured container name. Therefore listing and then accessing containers failed in the client. Furthermore, configuring a container in the appsettings with the same name as the folder on disk lead to an exception.

This is fixed now and the returned list looks as expected.

@saxx Is this change a problem for any of our clients already consuming the simulator?

PS: The broken E2E test is fixed in #3 .

Before:

After:

Used config:

 "Storage": {
    "LocalPath": "/tmp/storage",
    "Accounts": [
      {
        "Name": "devstoreaccount1",
        "Key": "..."
      }
    ],
    "Containers": [
      {
        "Name": "configured-name-of-test-container",
        "LocalPath": "/tmp/storage/test"
      }
    ]
  }