rgy.py: make log_(data|metadata) configurable

The log_data and log_metadata are made configurable
via the YAML file and default to false
(meaning neither data nor metadata operations are
logged).

Signed-off-by: Joe Buck <jbbuck@gmail.com>
rgw.py: refactor configure

Extend the rados pool configuration options to
specify all pools (if desired).
Also, reordered zone and region configuration
so that they're configure (per client) in
this order: zone, region, set default region

Signed-off-by: Joe Buck <jbbuck@gmail.com>
s3readwrite.py: make user creation optional

Extend the s3readwrite.py task to enable the
creation and deletion of users for the s3readwrite
tests to be independently specified with the default
assumption to both being true.
This is needed for tests that will create a user and
data in one execution and read it in another.

Signed-off-by: Joe Buck <jbbuck@gmail.com>