Stop using intersphinx

Remove intersphinx from the docs build as it triggers network calls that
occasionally fail, and we don't really use intersphinx (links other
sphinx documents out on the internet)

This also removes the requirement for internet access during docs build.

This can cause docs jobs to fail if the project errors out on
warnings.

Change-Id: I71e941e2a639641a662a163c682eb86d51de42fb
Related-Bug: #1368910
Add a section for RPC API impact

Changes to the RPC API should definitely be considered.

This changes the unit test to verify specs for Kilo only
since we shouldn't hold past accepted specs to new template
changes.

Change-Id: I3f8857f92ae80cfef01fb4a88e8bdb6a1add1905
Merge "Stop using intersphinx"
Remove incubated theme

Kilo is open, so remove the incubated HTML theme.

Change-Id: Ia7de2569122a09604d93e09ed71fc5184663f891
Update template for Kilo

Change-Id: I743302220b3a614f8532ce6fde6b0db574d812d8
Automate testing of template titles

Instead of hard-coding the list of section titles in the unit test,
just auto-generate it by reading the template.

Change-Id: Ifa7bb3a207f2160c2e95b74dab7e2692aeea6ed1
Set up for kilo specs

This adds the entries in the index so that the main page will
list the specs in specs/kilo. To get sphinx to not err, a dummy
.rst file (based on the template.rst) was added to specs/kilo.
It should be deleted after we have an approved spec.

Without this temporary fix, all spec patches will basically
need to have the change in index.rst; otherwise Jenkins will
not be happy.

Note that the dummy .rst file needs to be added or sphinx will
complain because the specs/kilo/* pattern didn't match any
documents. Furthermore, the .rst file there must be valid
(based on the template) or the unit tests will fail. And lastly,
that dummy .rst file cannot be named 'template.rst' because
we've configured it to ignore all files named 'template.rst'. If
that is ignored, we're back to no files in specs/kilo, and sphinx
will be unhappy again.

Closes-Bug: #1379415
Change-Id: Ic4a40a5b085073bc9eebc3d2c75432f18f01cbef