The only real difference between netdev-patch and netdev-tunnel is in their
parse_config() implementation. That's a lot of extra code to maintain, for
questionable benefit. This commit merges them into the netdev-vport code,
which was heretofore merely a collection of helper functions.
Adding a macro to define the vlog module in use adds a level of
indirection, which makes it easier to change how the vlog module must be
defined. A followup commit needs to do that, so getting these widespread
changes out of the way first should make that commit easier to review.
In certain cases we require the ability to provide stats that are
added to the values collected by the kernel (currently only used
by bond fake devices). Internal devices previously implemented
this directly but now that their stats are now handled by the vport
layer the functionality has been moved there. This removes the
userspace code to set the stats and replaces it with a mechanism
to access the equivalent functionality in the vport layer.
