Add ssh related vars to example file

openstack.pkrvars.hcl.example

@@ -12,3 +12,9 @@ security_groups = ["allow ssh"]
 image_date_suffix = false
 # Set to a public key that will be added as a root ssh key
 root_ssh_key = "ecdsa-sha2-nistp256 AAAAyourkeyhere comment string here"
+# The username to connect to SSH with. Used by Packer build section
+ssh_username = "centos"
+# Key that will be used for SSH with the machine. Must match key pair name loaded up into the remote.
+ssh_keypair_name = ""
+# Path to the private key file to use to authenticate with SSH.
+ssh_private_key_file = ""