Bump version to 0.0.8 in prep for release.

Releasing new version to forge requires a version bump. Bump the
version to 0.0.8.

Change-Id: I8f2b16c66bfe637b3a7b37f3fb514867dd07a1da
Reviewed-on: https://review.openstack.org/18691
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins