I am trying to find a bug that seems to be triggered by a combination
of TCP timing and socket splicing. Add tests that use Scapy scripts
as client and server. That allows to drop, delay and retran

I am trying to find a bug that seems to be triggered by a combination
of TCP timing and socket splicing. Add tests that use Scapy scripts
as client and server. That allows to drop, delay and retransmit
single TCP packets to execute various code paths in the remote
OpenBSD stack.

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Reengineer the socket splicing regression tests:
- Move the tests from splice to new sosplice directory for consistent naming.
- Split the API tests and the TCP splicing tests into separate directori

Reengineer the socket splicing regression tests:
- Move the tests from splice to new sosplice directory for consistent naming.
- Split the API tests and the TCP splicing tests into separate directories.
- Create some tests for the upcoming UDP splicing.
- Tests can be run in obj directories now.
- The API tests can run both on a local and on a remote machine now.
- Fix the forking TCP tests which splice and read or write simultaneously.
- Bunch of little fixes for races in the tests.
- Deduplicate code, move checks into common functions.

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