added pfkey/esp-alg-null scenario

testing/tests/pfkey/esp-alg-null/evaltest.dat

@@ -0,0 +1,7 @@
+moon::ipsec statusall::rw.*INSTALLED::YES
+carol::ipsec statusall::home.*INSTALLED::YES
+moon::ipsec statusall::NULL/HMAC_SHA1_96::YES
+carol::ipsec statusall::NULL/HMAC_SHA1_96::YES
+moon::ip xfrm state::enc ecb(cipher_null)::YES
+carol::ip xfrm state::enc ecb(cipher_null)::YES
+carol::ping -c 1 -s 120 -p deadbeef 10.1.0.10::128 bytes from 10.1.0.10: icmp_seq=1::YES