- priority classes <-10 are ignored by cluster-autoscaler so QA jobs
with too low priorities never run
- start crawl priorities at 0 going down (same as before)
- start qa run priorities at -2 going down (instead of -100)
- this means a crawl of with scale of 3 can be preempted by 1st qa pod,
but otherwise crawls have higher priority
- rename priority classes as they are otherwise immutable and error on
helm upgrade
This allows for more room in lower pri classes for other type of
objects, while keeping in mind the -10 and below threshold: (see:
https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/FAQ.md)
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