Verify delete interface response of V2/V3 APIs

This patch adds the JSON schema for response status of Nova interface delete
APIs to block the backward incompatibility change in the future.

delete interface does not return the response body.
Response status of above APIs is 202 in v2/v3.

Partially implements blueprint nova-api-attribute-test

Change-Id: I8ff4f3e2b8912d29918965b4aa86cf807a9a23ca
Add parametric tests of Swift object API, part 2

Add positive tests of Swift object "GET" API from the viewpoint of
completeness of query parameters.

Change-Id: I3d4da9a8e431014cba5e96e01ea31ba4c7f54541
Merge "Add parametric tests of Swift object API, part 2"
Merge "Verify delete interface response of V2/V3 APIs"