Test bytes_sent bugs.

Test bytes_sent bugs.

Rearrange logic to make it easier to measure accumulation.
Instrument the boto request/response loop to count bytes in and out.
Accumulate byte counts in usage like structure.
Compare actual usage reported by ceph against local usage measured.
Report and assert if there are any short-comings.
Remove zone placement rule that was newly added at end: tests should be rerunable.

Nit: the logic to wait for "delete_obj" is not quite right.

Fixes: http://tracker.ceph.com/issues/19870
Signed-off-by: Marcus Watts <mwatts@redhat.com>
(cherry picked from commit a45ab45f74042617ec382f3d50f4d45d883042f5)