Renaming in HA guide

- Quantum to OpenStack Networking
- Nova to OpenStack Compute
- Keystone to OpenStack Identity
- Glance to OpenStack Image

Change-Id: I67b7cd2c9a06d49ad8b22cdeb2810f9368563e82
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge "Renaming in HA guide"