openshift.ks: Remove doc for CONF_NO_SSH_KEYS

Remove the documentation for CONF_NO_SSH_KEYS because the setting was
removed in commit a4d5df084153f13acb4334197304f41e43d38e0b.
Merge pull request #44 from Miciah/openshift.ks-remove-doc-for-CONF_NO_SSH_KEYS

openshift.ks: Remove doc for CONF_NO_SSH_KEYS