4.12 backport: Wait-for install-complete did not exit upon completion.

When the cluster install finished, wait-for install-complete command didn't exit as expected.

1. Get the latest agent-installer and build image
git clone https://github.com/openshift/installer.git
cd installer/
hack/build.sh
Edit agent-config and install-config yaml file
Create the agent.iso image:
OPENSHIFT_INSTALL_RELEASE_IMAGE_OVERRIDE=quay.io/openshift-release-dev/ocp-release:4.12.0-ec.3-x86_64 bin/openshift-install agent create image --log-level debug

2. Install SNO cluster
virt-install --connect qemu:///system -n control-0 -r 33000 --vcpus 8 --cdrom ./agent.iso --disk pool=installer,size=120 --boot uefi,hd,cdrom --os-variant=rhel8.5 --network network=default,mac=52:54:00:aa:aa:aa --wait=-1 

3. Run 'bin/openshift agent wait-for bootstrap-complete --log-level debug' and the command finished as expected.

4. After 'bootstrap' completion, run 'bin/openshift agent wait-for install-complete --log-level debug', the command didn't finish as expected.