Add wait_for_resource_deletion for swift api clients

Currently today we dont have any way in swift to verify that resources were deleted
before moving to the next command
In current code there was hardcoded sleep for 2 seconds instead of checking if
resource really deleted.

Added to the current cleanup :
Implement is_resource_deleted for object_client and container_client
After remove action we wait/ verify till resource really deleted
Remove hardcoded sleep for 2 seconds
Remove ignore for not found in reomval , if we hit on it means something
wrong in our code.

Change-Id: I32f37f8e874a3510bb1af6db45a1b9a8d2fed543
4 files changed