Rename my_openshift to my-openshift
Rename my_openshift to my-openshift

Instance hostnames are prefixed with stack name. If this stack name
contains '_' kubernetes fails.

Fixes #58

BBVA/openshift-on-openstack,markllama/openshift-on-openstack,redhat-openstack/openshift-on-openstack,redhat-openstack/openshift-on-openstack,BBVA/openshift-on-openstack,markllama/openshift-on-openstack