Merge pull request #70 from Apsu/v4.2.1rc

HA -- The Final Frontier
use global 'region' attr
Merge pull request #71 from invsblduck/issue593_region

Merged automatically by jenkins after successful build test
Merge branch 'v4.2.1rc' of github.com:rcbops-cookbooks/openstack-ha into v4.2.1rc