Use region from keystone settings

The keystone barclamp got the possibility to set a custom region
name. This name must be used by other barclamps as well.

related to: https://bugzilla.novell.com/show_bug.cgi?id=896481
Merge pull request #158 from toabctl/add-region-support

Use region from keystone settings
Quote parameters
Add missing region parameter

keystone is executed without the custom region name.
Merge pull request #160 from toabctl/quote-region-param

Quote region name parameter