Add OS_REGION_NAME to openrc

The openrc file that is downloaded from Horizon is missing the
OS_REGION_NAME setting. This causes issues in environments that have
multiple regions. If the Region is none, ensure that it is unset after
sourcing the rc file to avoid and empty variable. This fix also cleans
up some language in the generated openrc file.

Change-Id: Ieab0b13afd79158c6bf603891164f01aff3aabf3
Closes-Bug: #1334791
(cherry picked from commit a8692b7726fb43af867844950538eb5ce6436a35)
Merge "Add OS_REGION_NAME to openrc" into stable/icehouse