RGW: Cloud Restore cli and its corresponding response for user.

RGW: Cloud Restore cli and its corresponding response for user.

* For first and repititive request 202 Accepted will be corresponding response code.
* For CloudRestored status 200 OK will be corresponding response code.
* For conflicting requests 409 Conflict corresponding response code.

Also Fixed storage class update while listing objects.

Earlier while restoring object temporarily list-objects (s3api) and
radosgw-admin bucket list didn't have updated storage class. With this
fixed it now has the cloudtier storage class.

Signed-off-by: shreyanshjain7174 <ssanchet@redhat.com>