[VMWare] Make sure ssh key is pulled in running add-node.py
[VMWare] Make sure ssh key is pulled in running add-node.py

For the moment, from two python modules, which run ansible playbooks,
only one pulls in SSH key configured in ansible.cfg
It is 'ocp-on-vmware.py', but it should also be done in 'add-node.py'.
So, add the same logic in second module to avoid SSH connection errors
running 'add-node.py' module from other dirs/machines than
'ocp-on-vmware.py' had run on.

openshift/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,glennswest/openshift-ansible-contrib,cwilkers/openshift-ansible-contrib,openshift/openshift-ansible-contrib,cwilkers/openshift-ansible-contrib,openshift/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,cwilkers/openshift-ansible-contrib,openshift/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,dav1x/openshift-ansible-contrib,pschiffe/openshift-ansible-contrib,cwilkers/openshift-ansible-contrib