Mark the --region as mandatory
Mark the --region as mandatory

We used to permit to omit region in the old parameter syntax, although
we now throw a warning if it's missing. In the new parameter syntax,
--region is mandatory. It's enforced by build_dev_from_opts in
swift/common/ring/utils.py.

On the other hand, --replication-ip, --replication-port, and --meta
are not obligatory.

Change-Id: Ia70228f2c99595501271765286431f68e82e800b

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