ikev2: Only request reauth during IKE_AUTH if active reauth is not possible

If we can initiate the reauthentication ourselves, there is no reason to
explicitly request the peer to do so (at basically the same time).

testing/tests/ikev2/reauth-late/hosts/moon/etc/swanctl/swanctl.conf

@@ -3,6 +3,8 @@ connections {
    rw {
       local_addrs = PH_IP_MOON
 
+      pools = rw
+
       # short lifetimes for testing purposes
       reauth_time = 60m
       over_time = 10s
@@ -28,3 +30,9 @@ connections {
       proposals = aes128-sha256-x25519
    }
 }
+
+pools {
+   rw {
+      addrs = 10.3.0.0/24
+   }
+}