Labels specified in inventory file become upper case

Issue

• When we add new node, Node labels became True even though we specified it in inventory as 'true'.

Actual Result:

node-role.kubernetes.io/compute: True

Expected:

node-role.kubernetes.io/compute: true

• We specified the label and used inventry file with yaml format as:

    nodes:
      hosts:
        ose-master[1:3].example.com:
        ose-node1.example.com:
          openshift_node_labels:
            region: infra
            node-role.kubernetes.io/compute: true
            node-type: logging-es-node1