* Add missing uploadID test
... make variables in test code unexported.
* Add ServerNotInitialized test for ListObjectPartsHandler
* Add tests for ListObjectParts with signatureV2 and Anonymous requests
* Add failure test cases for ListObjectParts
* api/complete-multipart: tests and simplification.
- Removing the logic of sending white space characters.
- Fix for incorrect HTTP response status for certain cases.
- Tests for New Multipart Upload and Complete Multipart Upload.
* tests: test for Delelete Object API handler