Merge branch 'l2tpeth-info'

Guillaume Nault says:

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l2tp: add informations about l2tpeth interfaces in /sys

Patch #1 lets userspace retrieve the naming scheme of an l2tpeth
interface, using /sys/class/net/<iface>/name_assign_type.

Patch #2 adds the DEVTYPE field in /sys/class/net/<iface>/uevent so
that userspace can reliably know if a device is an l2tpeth interface.
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Signed-off-by: David S. Miller <davem@davemloft.net>