fixing waiting time metric

[jt-dd]

Fixing waiting time metric.

before:

INFO[11:53:08] Dumping Metadata                             
INFO[11:53:08] Stats for the run time duration: 57.097094292s / wait: 3m11.202109s / throttling: 334.871873% 
INFO[11:53:08] Dumping Metadata done          
INFO[11:53:09] KubeHound dump run has been completed in 58.66889575s          

after:

INFO[12:07:15] Dumping Metadata                             
INFO[12:07:15] Stats for the run time duration: 5m19.270919416s / wait: 4m54.122048s / throttling: 92.123031% 
INFO[12:07:15] Dumping Metadata done                        
INFO[12:07:18] KubeHound dump run has been completed in 5m43.414716208s 

[edznux-dd]

did you notice slowdown because you're locking before doing the rl.Take() call ? (I'm unsure about the contention it create there. I think it's fine but i'd need to dig a bit deeper if I wanted to make sure :D)

The unit test seems to be ok with the -race flag so I'd assume it's good enough to not end up in a deadlock (and I think it can't unless the rl.Take also can lock indefinitely which I don't think it can)