No actions to stop/start the postgresql process

[Peter Matulis]

I do not see any actions that actually stops/starts a postgresql process.

I'd rather not have to do:

$ juju ssh postgresql/0 sudo systemctl stop postgresql
$ juju ssh postgresql/0 sudo systemctl start postgresql

Suggested action names and descriptions, based on other bugs:

pause Pause the PostgreSQL service.
resume Resume the PostgreSQL service.

[Stuart Bishop (stub)]

The charm may even decide to restart PostgreSQL for you next time the update-status hook kicks in. If you need this reliable at the moment, you also need to shutdown the jujud.

[Stuart Bishop (stub)]

Add shutdown and startup actions. These actions should not trigger automatic failover.