Explain groups for DeprecatedOpts

The patch extends the documentation for `DeprecatedOpt` and explains
that group==None means the deprecated name will be looked up in the same
group.

Change-Id: I54ba414d6a6862e1b00dfbf589563ef9f4df5cf3
warn against sorting requirements

Change-Id: I64ae9191863564e278a35d42ec9cd743a233028e
Addresses-Bug: #1365061
Work toward Python 3.4 support and testing

Change-Id: Iadb1b695b8314d385716619561a1604a41f6c8d5
Updated from global requirements

Change-Id: Id105ee1d495144517a684edd49116cba24060529
Merge "Work toward Python 3.4 support and testing"
Merge "Explain groups for DeprecatedOpts"
Looks for variable subtitution in the same group

When we do a variable subtitution we must try to look if the option
is avialable into the same group and then into the default one for backward
compatibilty.

Otherwise variable subtitution doesn't works when we change the group of
an option and deprecated the DEFAULT group.

Change-Id: Ie5750ee028a58fba6da225a8c4b4221e23db829f
Closes-bug: #1367790
Merge "warn against sorting requirements"
Merge "Looks for variable subtitution in the same group"
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
Updated from global requirements

Change-Id: Ifc3b21982b35ee6deac637cd438c5e31b0c9cacf
Fix docs example using generator config files

This commit fixes the namespace usage in the example config files for
the config generator docs. Previously the example used the
nova.compute namespace twice, however based on the other examples
above one is a typo and should be nova.common instead.

Change-Id: I426f4a3b97124b4a7eecda52ce52232cdcbc32ca