Wait for snapshot to complete before creating an image from it
Rever logging output of commands while they are running

Images created with this command runner fail to boot, complaining about
corrupted disks.

This reverts these commits:
- 7fa37308dfa9dd5885e3e55804ccf98b75e249b7
- 70373bed27a2e246f002ab9ef9fb0d05bc7dc418
- d4410fa07bb776ac78cddd63f190ce6f4c84f793