vici: Make IKEv2 the default IKE version

We don't want to accept IKEv1 clients anymore by default, so we also
warn them about it in the log.

testing/tests/ike/frags-ipv4/hosts/moon/etc/swanctl/swanctl.conf

@@ -13,12 +13,13 @@ connections {
       }
       children {
          net {
-            local_ts  = 10.1.0.0/16 
+            local_ts  = 10.1.0.0/16
 
             updown = /usr/local/libexec/ipsec/_updown iptables
             esp_proposals = aes128-sha256-ecp256
          }
       }
+      version = 0
       mobike = no
       fragmentation = yes
       proposals = aes128-sha256-ecp256

testing/tests/ike/frags-ipv6/hosts/moon/etc/swanctl/swanctl.conf

@@ -1,7 +1,7 @@
 connections {
 
    rw {
-      local_addrs = fec0::1 
+      local_addrs = fec0::1
 
       local {
          auth = pubkey
@@ -13,12 +13,13 @@ connections {
       }
       children {
          net {
-            local_ts = fec1::/16 
+            local_ts = fec1::/16
 
             updown = /usr/local/libexec/ipsec/_updown iptables
             esp_proposals = aes128-sha256-ecp256
          }
       }
+      version = 0
       mobike = no
       fragmentation = yes
       proposals = aes128-sha256-ecp256