Issue 51051 - CLI fix consistency issues with confirmations
Description: The remove-all feature of dsctl uses different confirmation
prompt than "dsctl remove". To fix this the "countdown" style
confirmation was moved to "remove_all", as "dsctl INST remove"
already had an additional argument.
Also cleaned up unused imports other various bugs found by my
IDE.
relates: https://pagure.io/389-ds-base/issue/51050
Reviewed by: firstyear(Thanks!)