Allow using RSA keys when packer ssh communicator tries to ssh.

Latest versions of packer removed ssh-rsa keys from accepted methods of
publickey auth. This commit is a workaround to allow ssh-rsa to be used
for ssh by packer communicator to ssh into build instance.
This should be fixed in the upcoming iterations to use correct methods
like ssh-ecdsa etc.

openstack-compute/nodeimage.pkr.hcl

@@ -25,8 +25,13 @@ build {
   provisioner "ansible" {
     groups = ["compute"]
     playbook_file = "./ansible/compute.yml"
+    ansible_env_vars = [
+      "ANSIBLE_SSH_ARGS='-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedKeyTypes=ssh-rsa'",
+      "ANSIBLE_HOST_KEY_CHECKING=False"
+    ]
     roles_path = "./ansible/roles"
     extra_arguments = [
+      "--scp-extra-args", "'-O'",
       "--extra-vars", "root_ssh_key='${var.root_ssh_key}'"
     ]
   }

openstack-gpu/nodeimage.pkr.hcl

@@ -21,8 +21,13 @@ build {
   provisioner "ansible" {
     groups = ["gpu"]
     playbook_file = "./ansible/gpu.yml"
+    ansible_env_vars = [
+      "ANSIBLE_SSH_ARGS='-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedKeyTypes=ssh-rsa'",
+      "ANSIBLE_HOST_KEY_CHECKING=False"
+    ]
     roles_path = "./ansible/roles"
     extra_arguments = [
+      "--scp-extra-args", "'-O'",
       "--extra-vars", "root_ssh_key='${var.root_ssh_key}'"
     ]
   }

openstack/nodeimage.pkr.hcl

@@ -26,8 +26,13 @@ build {
     user = var.ssh_username
     groups = ["base"]
     playbook_file = "./ansible/base.yml"
+    ansible_env_vars = [
+      "ANSIBLE_SSH_ARGS='-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedKeyTypes=ssh-rsa'",
+      "ANSIBLE_HOST_KEY_CHECKING=False"
+    ]
     roles_path = "./ansible/roles"
     extra_arguments = [
+      "--scp-extra-args", "'-O'",
       "--extra-vars", "root_ssh_key='${var.root_ssh_key}'"
     ]
   }