README: added prerequisity for a repository needed for python-openstackclient installation
README: added prerequisity for a repository needed for python-openstackclient installation

cwilkers/openshift-ansible-contrib,glennswest/openshift-ansible-contrib,scollier/openshift-ansible-contrib,cooktheryan/openshift-ansible-contrib,cooktheryan/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,openshift/openshift-ansible-contrib,scollier/openshift-ansible-contrib,Tlacenka/openshift-ansible-contrib,openshift/openshift-ansible-contrib,cooktheryan/openshift-ansible-contrib,scollier/openshift-ansible-contrib,cwilkers/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,openshift/openshift-ansible-contrib,cooktheryan/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,Tlacenka/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,cwilkers/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,scollier/openshift-ansible-contrib,Tlacenka/openshift-ansible-contrib,openshift/openshift-ansible-contrib,Tlacenka/openshift-ansible-contrib,cwilkers/openshift-ansible-contrib