testing: Enable firewall for ikev2/compress scenario

Additionally, send a regular (small) ping as the kernel does not
compress small packets and handles those differently inbound.

testing/tests/ikev2/compress/hosts/carol/etc/ipsec.conf

@@ -9,6 +9,7 @@ conn %default
 	keyingtries=1
 	keyexchange=ikev2
 	compress=yes
+	leftfirewall=yes
 
 conn home
 	left=PH_IP_CAROL

testing/tests/ikev2/compress/hosts/carol/etc/strongswan.conf

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 revocation hmac xcbc stroke kernel-netlink socket-default
+  load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 revocation hmac xcbc stroke kernel-netlink socket-default updown
 }

testing/tests/ikev2/compress/hosts/moon/etc/ipsec.conf

@@ -9,6 +9,7 @@ conn %default
 	keyingtries=1
 	keyexchange=ikev2
 	compress=yes
+	leftfirewall=yes
 
 conn rw
 	left=PH_IP_MOON

testing/tests/ikev2/compress/hosts/moon/etc/strongswan.conf

@@ -1,5 +1,5 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 revocation hmac xcbc stroke kernel-netlink socket-default
+  load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 revocation hmac xcbc stroke kernel-netlink socket-default updown
 }