`fail_minions` default to `None` now.

Improve list from string handling.
Construct the call using python types, don't stringify.
Always pass the current `saltenv` no matter which is it
Allow destroying multiple VMs
Revert "Allow destroying multiple VMs"

This reverts commit abdfdc20769216246cddc84b886209c76dcac66c.
Merge pull request #10681 from s0undt3ch/hotfix/cloud-orchestration

orchestration improvements