feature/extra-client-commands

[leewardbound]

Added the following

• hydra client start # systemctl start $name
• hydra client stop # systemctl stop $name
• hydra client restart # systemctl stop, kill, start $name
• hydra client logs # journalctl -u $name (with pager)
• hydra client tail-logs # journalctl -u $name --no-pager -n 200
• hydra client follow-logs # same as above with '-f'
• hydra client status # curl -s $HOST:$RPC_PORT/status

[leewardbound]

i'm gonna go ahead and merge this without a code review #yolo because it's fairly low impact and will make lives easier starting immediately