The “libvirt-guests” service can conflict with “onevm-all” and we
don't need to wait for each VM to boot during start.
* posttemplate/10-libvirt-guests: disable the “libvirt-guests” service.
* init/onenode.service (ExecStart): use default wait timeout (60s).
(TimeoutStartSec): wait for longer than the default timeout.
(ExecReload): just try to resume any remaining VMs.
(ExecStop): wait longer for VM to suspend.
(TimeoutStopSec): wait for longer than the stop timeout.
* scripts/onevm-all: schedule actions in parallel and wait globally
for their executions.
Ref: #22155
