[RFE] Consider non disruptive actions

[grafuls]

Is your feature request related to a problem? Please describe.
Given the flexibility we could achieve with custom actions, we might consider constructive actions like backups, logrotate, etc.

Describe the solution you'd like
Add custom action to send a command line. Something like:

• action:
  name: command
  params: "engine-backup --mode=backup --scope=all --file=engine.bkp --log=bkp.log"
  target_host....