Storage Dataplane: Get container properties support both Get and HEAD, but in swagger only has Get defined.

Per [rest API doc](https://docs.microsoft.com/en-us/rest/api/storageservices/get-container-properties), Get container properties support both Get and HEAD , but in [swagger ](https://github.com/Azure/azure-rest-api-specs/blob/1a7b2bbb84370bd96c0bf53f13f56f4fc2cafab9/specification/storage/data-plane/Microsoft.BlobStorage/preview/2019-02-02/blob.json#L677)only has Get defined.

Open specification/blob/data-plane/Microsoft.BlobStorage/preview/2019-02-02/blob.json at the container-properties operation referenced in the issue, and compare it with the linked Get container properties REST documentation. Verify how the specification represents the supported HTTP methods, then validate the updated swagger; done means both GET and HEAD are represented for this operation.

Written by the indexing model from the issue text.