XaaS in Glossary
XaaS in Glossary

Use "X-as-a-Service" in the glossary.

Add new entry Firewall-as-a-Service.
Remove unused entry Red Dwarf Lite
Improved wording of some entries.

Change-Id: I8bbb3e30557c3659fc649310d79f44daccc913cf

openstack/openstack-manuals,openstack/openstack-manuals,gongysh2004/openstack-manual,potsmaster/openstack-manuals,openstack/openstack-manuals,potsmaster/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,kairoaraujo/openstack-manuals,saeki-masaki/openstack-manuals,saeki-masaki/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,gongysh2004/openstack-manual,AlekhyaMallina-Vedams/openstack-manuals,Akasurde/openstack-manuals