Revert "Update smslabs keys after loss of ansible host"

This reverts commit b8b1c4e.

Author: sjpb

environments/.stackhpc/SMS.pkrvars.hcl

@@ -3,8 +3,7 @@ networks = ["26023e3d-bc8e-459c-8def-dbd47ab01756"] # stackhpc-ipv4-geneve
 source_image_name = "openhpc-230503-0944-bf8c3f63" # https://github.com/stackhpc/ansible-slurm-appliance/pull/252
 fatimage_source_image_name = "Rocky-8-GenericCloud-8.6.20220702.0.x86_64.qcow2"
 ssh_keypair_name = "slurm-app-ci"
-ssh_private_key_file = "~/.ssh/id_ed25519"
-ssh_bastion_private_key_file = "~/.ssh/id_ed25519"
+ssh_private_key_file = "~/.ssh/id_rsa"
 security_groups = ["default", "SSH"]
 ssh_bastion_host = "185.45.78.150"
 ssh_bastion_username = "steveb"