Automated cherry pick of #660: Fix sub exception in reclaim and preempt #666: Fix wrong caculation for deserved in proportion plugin #671: Change base image to alphine to reduce image size #673: Do not create PodGroup and Job for task whose scheduler is

[asifdxtreme]

Cherry pick of #660 #666 #671 #673 on release-0.4.

#660: Fix sub exception in reclaim and preempt
#666: Fix wrong caculation for deserved in proportion plugin
#671: Change base image to alphine to reduce image size
#673: Do not create PodGroup and Job for task whose scheduler is

[k8s-ci-robot]

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