py3-scapy is now scapy

OK bluhm sthen

Missed a python2.7, scapy 2, copyright bump in previous scapy 3 commits.

Switch to scapy with python 3.

Remove echo headlines.

Simplify the detection for installed python and scapy. Refactor
these tests to make them similar. Use the setup and cleanup
variables.

Skip this regress test if no remote test machine is specified as
environment variable.

Remove useless make depend targets.

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

The clean:, cleandir:, and obj: targets of src/Makefile descend into
regress/ and run python to set the IMPORT_PYTHON variable in several
test Makefiles. This results in W^X violations during 'make b

The clean:, cleandir:, and obj: targets of src/Makefile descend into
regress/ and run python to set the IMPORT_PYTHON variable in several
test Makefiles. This results in W^X violations during 'make build'.
Avoid doing that.

ok bluhm

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Print SKIPPED if a regress test cannot be executed for some reason.
This allows to identify such tests by looking at their output.

Replace a sudo with ${SUDO}.

Do not fail the regression tests if python or the scapy package is
not installed. Print a warning, explain the problem and skip the
test in this case. Also skip the test if the environment has not

Do not fail the regression tests if python or the scapy package is
not installed. Print a warning, explain the problem and skip the
test in this case. Also skip the test if the environment has not
been configured for the remote test target machine. Fix the Makefile
to run the tests with or without an obj directory. Finally link
the netinet6 regression tests into the build.

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Add test suite for IPv6 neighbor discovery protocol. Send all kind
of solicitations to remote host and check responses. This can be
used to test both pf neighbor discovery states and the IPv6 stack.