Fix is available in openshift-ansible-3.6.173.0.103-1.git.0.dcf417c.el7

Verified in openshift-ansible-3.6.173.0.104-1.git.0.ee43cc5.el7.noarch.rpm

For 3.6 fresh installations, now the node objects are created with lower case.

# cat inventory_host
<--snip-->
[masters]
QE-GHUANG-36-Master-1.02234-659.qe.rhcloud.com openshift_public_hostname=QE-GHUANG-36-Master-1.02234-659.qe.rhcloud.com openshift_hostname=QE-GHUANG-36-Master-1
[nodes]
QE-GHUANG-36-Master-1.02234-659.qe.rhcloud.com ansible_user=root ansible_ssh_user=root  openshift_public_hostname=QE-GHUANG-36-Master-1.0223-659.qe.rhcloud.com openshift_hostname=QE-GHUANG-36-Master-1 openshift_node_labels="{'role': 'node'}"
QE-Ghuang-36-Node-Registry-Router-1.02234-659.qe.rhcloud.com openshift_public_hostname=QE-Ghuang-36-Node-Registry-Router-1.02234-659.qe.rhcloud.com openshift_hostname=QE-Ghuang-36-Node-Registry-Router-1 
<--snip-->

# grep masterKubeConfig /etc/origin/node/node-config.yaml
masterKubeConfig: system:node:qe-ghuang-36-master-1.kubeconfig

# grep nodeName /etc/origin/node/node-config.yaml
nodeName: qe-ghuang-36-master-1

# openssl x509 -in /etc/origin/node/system:node:qe-ghuang-36-master-1.crt -noout -text |grep -i ghuang
        Subject: O=system:nodes, CN=system:node:qe-ghuang-36-master-1

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:1106