copr-be: converge the ipv6 networking faster

roles/copr/backend/templates/provision/libvirt-new

@@ -321,12 +321,16 @@ class LibvirtSpawner:
         """
         self.boot_options += ['--network', 'bridge=br0,model=virtio']
         self.append_startup_script("\n".join([
-            "echo ahoj >> /var/tmp/ahoj",
             f"nmcli con add con-name '{con_name}' ifname {device} "
-            "type ethernet",
+            # Don't automatically start, otherwise DHCPv4 starts, too.
+            "type ethernet autoconnect no",
             f"nmcli con modify '{con_name}' ipv6.address {ipv6_addr}",
             f"nmcli con modify '{con_name}' ipv6.gateway {ipv6_gw}",
             f"nmcli con modify '{con_name}' ipv4.method disabled",
+            f"nmcli con up '{con_name}'",
+            # This makes the IPv6 networking to converge faster
+            'for _ in `seq 180`; do ping6 -c 1 fedoraproject.org && break ; sleep 1; done',
+
         ]))
         self.ipv6 = ipv6_addr.split("/")[0]