setup: Changing task cleaner utility to also handle removal of commands

The task cleaner utility now has the ability to present all commands
or commands with running tasks, and to erase commands (or commands with
running tasks)

Bug-Url: https://bugzilla.redhat.com/1161012
Change-Id: I1d8f83cb7fc1f7fecb4ea68dff5cf0f3c63eeb6b
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>