Merge branch 'tc-mpls-l2-vpn' into next

Guillaume Nault  says:

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This patch series adds the possibility for TC to tunnel Ethernet frames
over MPLS.

Patch 1 allows adding or removing the Ethernet header.
Patch 2 allows pushing an MPLS LSE before the MAC header.

By combining these actions, it becomes possible to encapsulate an
entire Ethernet frame into MPLS, then add an outer Ethernet header
and send the resulting frame to the next hop.

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Signed-off-by: David Ahern <dsahern@gmail.com>