sysmobts: Actions can be executed in all levels
sysmobts: Actions can be executed in all levels

Somebody could decide to switch off the PA in the warning level
already. Support this mode of operation. This means we could have
a config that:

* Enables the PA in the normal level
* Disables it in the critical level

With kdbus or better IPC we could even have the PA and other
parts be represented as service that talk to a bts manager and
then simply execute start/stop requests. This would make the
entire TODO entry irrelevant as state would be managed by
systemd and one can see the time the service was executed.

osmocom/osmo-bts,osmocom/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,osmocom/osmo-bts