Add the flowtype to the inpcb.

The flowid isn't enough to use as part of any RSS related CPU affinity
lookups - the RSS code would like to know what kind of hash it is.
Add a new function to do a CPU ID lookup based on RSS hash information.

This is intended to be used by various places that wish to hash some
information about a TCP/UDP/IP flow but don't necessarily have a
live mbuf to do it with.

Refactor rss_m2cpuid() to use the refactored function.
Ensure that the flowid hashtype is assigned to the inp if the flowid
is also assigned.
* When copying the flowid from inp -> outbound mbuf, also assign the
  hashtype to to the outbound mbuf as well as the flowid.

* Add in socket options to fetch the hashid, the hashtype and RSS CPU
  ID for a given socket.
When RSS is enabled and per cpu TCP timers are enabled, do an RSS
lookup for the inp flowid/flowtype to destination CPU.

This only modifies the case where RSS is enabled and the per-cpu tcp
timer option is enabled.  Otherwise the behaviour should be the same
as before.
This is the beta release of the driver for the new
Intel 40G Ethernet Controller XL710 Family. This is
the core driver, a VF driver called i40evf, will be
following soon. Questions or comments to myself or
my co-developer Eric Joyner. Cheers!