add RHIVOS support for misc/wait-guest-poweroff -update

Chen Shaorequested to merge
cshao1/kernel-tests:misc/wait-guest-poweroff into main

@olivergs, the previous path didn't include proper RHIVOS ostree testing, so I update some part and tested passed on x86_64 and aarch64. Please help me review and merge this MR. Thanks!

RHIVOS log for x86:(failed to upload log to bos server, so upload log in my http server firstly) http://10.73.197.135/cshao/tmtlog/wait-guest-poweroff/wait-guest-poweroff-x86-log.txt

RHIVOS log for aarch64: http://10.73.197.135/cshao/tmtlog/wait-guest-poweroff/aarch64/wait-guest-poweroff-aarch-log.txt

Beaker job: https://beaker.engineering.redhat.com/jobs/7948618

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