kill with no arguments prints useless information

[PawelPlesniak]

If no arguments are presented, ask for some.

[PawelPlesniak]

drunc-unified-shell > kill
[15:40:50] INFO     ssh_process_manager.py:416      ssh-process-manager:    Killing                                                                                                                                            
           WARNING  ssh_process_manager.py:418      ssh-process-manager:    Killing all the known processes before exiting                                                                                                     
                           Killed process                           
┏━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━┳━━━━━━┳━━━━━━┳━━━━━━━┳━━━━━━━━━━━┓
┃ session ┃ friendly name ┃ user ┃ host ┃ uuid ┃ alive ┃ exit-code ┃
┡━━━━━━━━━╇━━━━━━━━━━━━━━━╇━━━━━━╇━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━━┩
└─────────┴───────────────┴──────┴──────┴──────┴───────┴───────────┘

[PawelPlesniak]

Fixed, awaiting PR#289