Behavior related to user confirmations for operation varies for different commands

[elhimov]

The mentioned differences can be divided into following topics:

1. Confirmation target
   restart and kill commands ask for confirmation once and if confirmed apply the corresponding operation for all instances (when target implies multiple instances, like app-target in case of multi-instances application)
   clean asks confirmation for every single instance implied by target.
2. Discard reply
   restart displays text • Restart is cancelled.
kill produces no output, just finish the execution.
   clean displays • instance: cleaning... [ERR] canceled by user after every discarding.
3. State validation
   clean only asks for confirmation if an instance is not running, otherwise just skips it with displaying instance `some_instance` must be stopped
kill asks for confirmation regardless of instances states.

Consider using the single approach.