To help surface deprecation warnings more visible when running
Django commands locally (rather than just when running pytest).
These will not cause the command to fail.
Since they're not specific to the Django app 'webapp'.
Whilst we're there, the local & example settings files have been
renamed. In the future I'd like to combine settings_local.example.py
with puppet/files/treeherder/local.vagrant.py, but I'll do that in
another bug.
The MPL 2.0 terms state that as long as a LICENSE file is present, the
per-file header text is not required. See "Exhibit A" at the end of:
https://www.mozilla.org/MPL/2.0/