Merge branch 'mlxsw-selftest-fixes'

Petr Machata says:

====================
selftests: mlxsw: Fixes

This patch set carries fixes to selftest issues that we have hit in our
nightly regression run. Almost all are in mlxsw selftests, though one is in
a generic forwarding selftest.

- In patch #1, in an ERSPAN test, install an FDB entry as static instead of
  (implicitly) as local.

- In the mlxsw resource-scale test, an if statement overrides the value of
  $?, which is supposed to contain the result of the test. As a result, the
  resource scale test can spuriously pass.

  In patches #2 and #3, remove the if statements to fix the issue in,
  respectively, port_scale test and tc_flower_scale tests.

- Again in the mlxsw resource-scale test, when more then one sub-test is
  run, a successful sub-test overrides any previous failures. This causes a
  spurious pass of the overall test. This is fixed in patch #4.

- In patch #5, increase a tolerance in a mlxsw-specific RED backlog test.
  This test is very noisy, due to rounding errors and the unpredictability
  of software traffic generation. By bumping the tolerance from 5 % to 10,
  get the failure rate to zero. This shouldn't impact the accuracy,
  mistakes in backlog configuration (e.g. due to wrong cell size) are
  likely to cause a much larger discrepancy.

- In patch #6, fix mausezahn invocation in the mlxsw ERSPAN scale
  test. The test failed because of the wrong invocation.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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