copr-backend: prefer ssh over ipv4 to copr_hypervisor

roles/copr/backend/files/ssh_config

@@ -5,3 +5,6 @@ Host *
    ServerAliveInterval 20
    ServerAliveCountMax 5
    ConnectTimeout 60
+
+Host{% for host in groups["copr_hypervisor"] %}{{- ' ' + host }}{% endfor %}
+  AddressFamily inet

roles/copr/backend/tasks/main.yml

@@ -65,6 +65,8 @@
 
 - name: setup copr user ssh config file
   copy: src="ssh_config" dest=/home/copr/.ssh/config  owner=copr group=copr mode=600
+  tags:
+    - copr_ssh_config
 
 - name: check known_hosts file
   command: stat /home/copr/.ssh/known_hosts