Description of problem:

test bare metal host shut down operation,
it consist of two steps:
1) Start Node maintenance from UI/CLI, waiting until Node maintenance will reach "Succeeded" phae
2) Gracefully Shut down from UI

After some time after shutting down node - cluster isn't operable from UI or OC console 

[cloud-user@rhhi-node-worker-0 dev-scripts]$ oc status
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get routes.route.openshift.io)
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get imagestreams.image.openshift.io)
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get buildconfigs.build.openshift.io)
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get deploymentconfigs.apps.openshift.io)
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get builds.build.openshift.io)

While I'm able to login to another master

oc status
In project default on server https://api.rhhi-ahrechan-tlv.qe.lab.redhat.com:6443

svc/openshift - kubernetes.default.svc.cluster.local
svc/kubernetes - 172.30.0.1:443 -> 6443

View details with 'oc describe <resource>/<name>' or list everything with 'oc get all'.


after some time API connectivity returns

[cloud-user@rhhi-node-worker-0 dev-scripts]$ oc status
In project default on server https://api.rhhi-ahrechan-tlv.qe.lab.redhat.com:6443

svc/openshift - kubernetes.default.svc.cluster.local
svc/kubernetes - 172.30.0.1:443 -> 6443



Version-Release number of selected component (if applicable):
4.2.0-0.nightly-2019-08-22-043819

How reproducible:
Always

Steps to Reproduce:
1.Deploy RHHI
2.Start maintenance for bare metal host
3.Shut down bare metal host
4. Check API connectivity

Actual results:
after shut down - Error from server (ServiceUnavailable): the server is currently unable to handle the request 

Expected results:
Cluster is alive all time when shut down 1 of 3 master

Additional info: