Rename private key with public key to reflect facts.
Rename private key with public key to reflect facts.

Currently authorized_keys were populated properly, but name
was confusing as it was done from {{ privatekey }} where in fact
it should be from public SSH key.

Also small change where one task was injecting local SSH key pairs
and was telling it's injecting only private SSH key.

Change-Id: I979fa9962e08efde38701fc8a96533a244a8ec95

okolisny/InfraRed,okolisny/InfraRed,okolisny/InfraRed,redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared