[charms] review abandonment policy

Hi Charms Contributors

As part of this cycles work to put in more proactive general maintenance of the Gerrit review queue for the OpenStack Charms projects we have introduced an abandonment policy for reviews:

https://docs.openstack.org/charm-guide/latest/community/rotas.html#abandonme...

Pruning the set of open reviews on a regular basis against this policy will help reviewers focus on active reviews.

We'll start doing this in January - you can follow the blocked/failing links in the charm-guide policy section to see which reviews will be abandoned at any given point in time.

Cheers

James