ci-multinode: Wait for connection in fix-networking.yml

This allows us to drop the fix-homedir-ownership.yml playbook in
terraform-kayobe-multinode, which also performed the function of waiting
for hosts to become reachable.

Author: markgoddard

etc/kayobe/ansible/fix-networking.yml

@@ -10,6 +10,9 @@
     # Work around no known_hosts entry on first boot.
     ansible_ssh_common_args: "-o StrictHostKeyChecking=no"
   tasks:
+    - name: Ensure hosts are reachable
+      ansible.builtin.wait_for_connection:
+
     - name: Ensure `hosts` file contains pulp and API entries
       blockinfile:
         path: /etc/hosts