[glossary] Consolodate project codenames [magnum]
[glossary] Consolodate project codenames [magnum]

- Combine "Container Infrastructure Management service"
  entry with "magnum" entry
  - Rename "Container Infrastructure Management service" to "Container
    Infrastructure Management service (magnum)"
  - Link "magnum" to "Container Infrastructure Management service (magnum)"
  - Make sure description matches project.yaml

Change-Id: I2bef68d1ea41b05918e2e8fa1cef391730f11565
Implements: bp improve-glossary-usage

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals