Test Case to check "copy object across container"

Adds a test case to "test_object_services.py" so as to check successful
copy of objects across containers. Also renamed existing 'copy_object'
method in object_client.py to 'copy_object_in_same_container' so as to
be more specific about the action that method does. Hence modified
test cases that earlier used 'copy_object' method  to use
'copy_object_in_same_container' method.

Change-Id: I3182122d115586a4027b92b92a34eaaeba4dc2db
Implements: blueprint add-some-functional-swift-tests
2 files changed