Wrap long lines.

Switch to scapy with python 3.

Link regress/sys/netinet/frag to build. Get IPv4 and IPv6 fragment
tests into common shape. Add some missing test cases.

Use consistent address schema with local and remote machine. Fill
variables with example IPs from my daily test run.

Do not use privileged or NFS source ports for UDP packets as inetd
ignores such packets. This should avoid some sporadic failures.
While there, use variable names consistently in all tests.

Put all make targets in a loop and print a little more what each
IPv6 fragment header test is doing.

Fix tests: Restrict getpid() to lower 16 bit so that it can still
be used as packet id. Now scapy calls nexthopmtu with this name
explicitly in icmp structure.

Use a simpler expression to check the ether type in scapy. This
makes the fragment tests work on FreeBSD. From Ilya Bakulin.

fix typo in fragment payload

Add IPv6 tests for fragmented destination options, fragments without
payload, fragmented UDP packets.

Do not read dstaddr from command line, get it from addr.py.

According to RFC 5722 we drop all IPv6 fragments that belong to a
packet with overlaps. Adapt existing tests and add one more.

Add tests for IPv6 fragment reassembly. Hand-crafted ping6
echo-request fragments are sent by scapy to the target machine.
There they get reassembled and a echo-reply comes back. The ping6
payload

Add tests for IPv6 fragment reassembly. Hand-crafted ping6
echo-request fragments are sent by scapy to the target machine.
There they get reassembled and a echo-reply comes back. The ping6
payload is checked.

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