Graceful shutdown of Virtual Machines from worker nodes in OpenShift 4

Issue

• The OpenShift control plane was lost, how to gracefully shutdown Virtual Machines from OpenShift Virtualization before shutting down the worker nodes?
• Shutting down Virtual Machines from their own OS automatically restart the Virtual Machines.
• Virtual Machines are shut down hard instead of gracefully if a worker node is rebooted or shut down manually.
• QEMU process receives SIGTERM signal when the virt-launcher pod scope is being stopped on shutdown/reboot.