Add idiag-socket-details

This small program lists all sockets on the system seen by netlink and serves
as a simple example showing how to alloc an idiag msg cache and dump the
objects in it.
More safely parse vegas info and mem info.
Add VXLAN support.
Merge pull request #45 from chibacchie/vxlan

Add VXLAN support
link: add support for IFLA_PHYS_PORT_ID

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Merge pull request #44 from sassanosystems/idiag

Idiag