[WIP] Enable to stop one or more labs

[jedrekdomanski]

Make

labctl playground stop playID

to accept a list of playground IDs. Pretty much make it work like docker stop

docker stop cont1 cont2 cont3

so it looks like

labctl playground stop playID1 playID2 playID3

[jedrekdomanski]

@iximiuz The code does what I expect it to do (it iterates over the list of passed in playground IDs to stop command), however the spinner somewhat stands on my way now and I can't get my head around how it works. It will just process the first playground ID and "eat" all other playgrounds so they won't get stopped. Can you take a look at it? 👁️

[jedrekdomanski]

Or it may as well be related to GET'ing the playground ID which checks the status before it continues processing. I noticed that GET'ing a list of playgrounds in CLI is somewhat "laggy". What I mean by that is that when I refresh the dashboard page I see the playgrounds are gone however when I GET the list of playgrounds in CLI it still shows some active playgrounds. Not sure which is the source of truth here :)