MFC r273135:
Update the OFED Linux compatibility layer and
Mellanox hardware driver(s):

- Properly name an inclusion guard
- Fix compile warnings regarding unsigned enums
- Add two new sysctl nodes
- Remove all empty linux header files
- Make an error printout more verbose
- Use "mod_delayed_work()" instead of
  cancelling and starting a timeout.
- Implement more Linux scatterlist
  functions.

Sponsored by:	Mellanox Technologies
Merge remote-tracking branch 'freebsd/stable/10' into hardened/10/aslr