Merge branch 'vxlan-xmit-improvements'

Pravin B Shelar says:

====================
vxlan: xmit improvements.

Following patch series improves vxlan fast path, removes
duplicate code and simplifies vxlan xmit code path.

v2-v3:
Removed unrelated warning fix from patch 2.
rearranged error handling from patch 3
Fixed stats updates in vxlan route lookup in patch 4

v1-v2:
Fix compilation error when IPv6 support is not enabled.
====================

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