Add region parameter for CLI upsage

Use the custom region name when executing the CLI.

related to: https://bugzilla.novell.com/show_bug.cgi?id=896481

(cherry picked from commit c264cadcc73cd8d65d31f38c5c67ade19e3679db)
Merge pull request #95 from toabctl/c4-region-support

Use region from keystone settings