Description of problem: The ansible and quick install fail when the HostName is manually defined containing a Capital Letter.

- The install takes the env variable with the capital letter and passes it through with the command #oc get node <openshift_hostnamem> 

the anisable installer hase this as <openshift_nodes> 

Kubernetes converts the names of the nodes to lower case and will not recognize a node name with a capital letter. Example: 

HostName:   Node1.example.com 
Kubernetes names the node:    node1.example.com 

Ansible install checks on the node registration with the following: 

#oc get node Node1.example.com 


The installer in turn fails. 




Version-Release number of selected component (if applicable): v3.0.1


How reproducible:
100%
Quick and Advanced 

Steps to Reproduce:
1.  Spin up a new vm follow the docs to get it ready
2.  Edit your ansible host file with the names of the hosts using capital letters. Also manual define the variables openshift_hostname openshift_public_hostname 
3.  Run the Ansible installer 

Actual results:

Installer fails to register nodes, stops before the SDN is configured

Expected results:

Installer completes, converts the capital letters to lower case when running kubernetes commands to check nodes. 

Additional info:

Ansible Code that fails:
https://github.com/openshift/openshift-ansible/blob/16175aa7db9073ccc8173efea752a66f3b4a27c2/roles/openshift_manage_node/tasks/main.yml#L1-L8

Work around: 
Change all names and variables in /etc/ansible/hosts to lower case