Merge branch 'More-mirror-to-gretap-tests-with-bridge-in-UL'

Petr Machata says:

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More mirror-to-gretap tests with bridge in UL

This patchset adds two more tests where the mirror-to-gretap has a
bridge in underlay packet path, without a VLAN above or below that
bridge.

In patch #1, a non-VLAN-filtering bridge is tested.

In patch #2, a VLAN-filtering bridge is tested.
====================

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