Merge branch 'mptcp-selftests'

Mat Martineau says:

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mptcp: Some selftest improvements

Here are a couple of selftest changes for MPTCP.

Patch 1 fixes a mistake where the wrong protocol (TCP vs MPTCP) could be
requested on the listening socket in some link failure tests.

Patch 2 refactors the simulataneous flow tests to improve timing
accuracy and give more consistent results.
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Signed-off-by: David S. Miller <davem@davemloft.net>