net: Find the nesting level of a given device by type
(bnc#829110 bnc#891277 bnc#904053).

suse-commit: c9ace14e38e31f22bea7553fe63d1bdff5944b75
net: generic dev_disable_lro() stacked device handling
(bnc#829110 bnc#891277 bnc#904053).

suse-commit: 12d1652e43681d3f86ace54515f67168ae3f6784
macvlan: allow setting LRO independently of lower device
(bnc#829110 bnc#891277 bnc#904053).

suse-commit: 3d38aada9e65dbf6fc6b4a2c9eed05d4ecca95fc