Beginning in the Stein release, Ubuntu distro packages are now using
Python3. Conflicting packages have been removed or updated to their
Python3 equivalents. The 'horizon_manage' variable has been updated to
ensure that python3 is used to run manage.py commands.
Values for STATIC_ROOT and LOCALE_PATHS have also been added to the
local_settings.py template. Defaults for these settings are defined
in the setting.py provided by Ubuntu packages, but those defaults
required the 'Collect and compress static files' and 'Compile messages'
tasks be run by the root user, instead of horizon. STATIC_ROOT also
needed to correlate to the folder apache is configured to serve.
Change-Id: Iaa41593e3a91640bd9c5d531da8238c04d7e747b
67db4e81a9