tests: add a icmp-reply only and icmpv6 id test cases

tests: add a icmp-reply only and icmpv6 id test cases

Check that nft doesn't remove the dependency in these cases:
icmp type echo-reply icmp id 1
("icmp id" matches both echo request and reply).

Add icmpv6 test cases.  These fail without the previous patches:

add rule ip6 test-ip6 input icmpv6 id 1:
 'icmpv6 id 1' mismatches
 'icmpv6 type { echo-request, echo-reply} icmpv6 parameter-problem 65536/16'

add rule ip6 test-ip6 input icmpv6 type echo-reply icmpv6 id 65534':
  'icmpv6 type echo-reply icmpv6 id 65534' mismatches
  'icmpv6 type echo-reply @th,32,16 65534'

Signed-off-by: Florian Westphal <fw@strlen.de>