Automatically convert the glossary from DocBook XML to RST with each
build and use it for building the RST guides.
Add the glossary to User Guides and Networking Guide.
Use glossary in User Guides in places where it was used before. This
removes one TODO.
Fix CORS capitalization.
Partial-Bug: #1421813
Change-Id: I3fba6d54b01759f39f8e1467a7606cdbd2dd0165