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Forbid enrolling an inactive user in a project or accepting their join
request. Also when setting a user inactive, suspend memberships for
terminated projects, too.

Merge changelogs of 0.18 and 0.18.1 and note that we recommend upgrading
from 0.17 to 0.18.1.

The quota policy plugin is responsible to query for overquota users,
if needed.

Put the migration script that suspends projects of deactivated users
under astakos/tools, rather than providing it as an snf-manage
command.

Refactor code that suspends projects of users, so that the loop is run
in user-check, which allows us to better show the progress of the
function.

Don't rely on field deactivated_at to find deactivated users.

Fix order of arguments in log display function.

Add option to user-check command to operate silently, ie without
sending email to affected users.

This reverts commit fb4e411e.

The commit breaks the intended usage of allow_create without
addressing it otherwise.

Check for flavor attribute 'allow_create' both when creating
a server and when changing a server to a new flavor.

Previously, the check was only made when creating a server.

 * Add gunicorn start/stop before/after the package upgrade
 * Add link to the 0.18 upgrade nodes in the Admin Guide
 * Fix copyright date