<net/if.h>: Do not include <net/if_var.h> for _KERNEL

* Clean up an ancient leftover: do not include <net/if_var.h> from <net/if.h>
for kernel stuffs.

* Adjust various files to include the necess

<net/if.h>: Do not include <net/if_var.h> for _KERNEL

* Clean up an ancient leftover: do not include <net/if_var.h> from <net/if.h>
for kernel stuffs.

* Adjust various files to include the necessary <net/if_var.h> header.

NOTE:
I have also tested removing the inclusion of <net/if.h> from <net/if_var.h>,
therefore add <net/if.h> inclusion for those files that need it but only
included <net/if_var.h>. For some files, the header inclusion orderings are
also adjusted.

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wlan - Sync netproto/802_11 from FreeBSD part 1/N

* Sync netproto/802_11 from FreeBSD, fbsd git dd885b9a0a0e, May 11 2016.

wlan - Update wlan from Adrian / FreeBSD

* Update the wlan infrastructure, initially working with ath.

kernel: Remove newlines from the panic messages that have one.

panic() itself will add a newline.

Remove empty DragonFly CVS IDs.

kernel: Use NELEM() where we can.

First pass at converting the net80211 infrastrcture from FreeBSD.