CA-105159: Wait for ack of shutdown request for HVM guest with PV drivers.
Allowing hard_shutdown and hard_reboot on a VM even when clean_shutdown and clean_reboot are in progress respectively.
SCTX-1334: Ensure that hard_shutdown and hard_reboot cancels clean_shutdown and clean_reboot respectively.
Merge pull request #1640 from ravippandey/Snowball/HFX-1008

Snowball/HFX-1008