Fixed cinder-backup start errors seen with devstack

Changes:
- Added cinder-backup to scripts in setup.py
- Added service_name to backup manager __init__
- Switched backup manager to using oslo.config
- Modified cinder-backup to use ProcessLauncher

Fixes bug: 1131147

Change-Id: I9b02d64def4ee892e9cfde4b4bcd50e5f9f9b707
Merge "Fixed cinder-backup start errors seen with devstack"