Fix up more files for the <net/if.h> / <net/if_var.h> split (fixes LINT64).

kernel: Move us to using M_NOWAIT and M_WAITOK for mbuf functions.

The main reason is that our having to use the MB_WAIT and MB_DONTWAIT
flags was a recurring issue when porting drivers from FreeBSD

kernel: Move us to using M_NOWAIT and M_WAITOK for mbuf functions.

The main reason is that our having to use the MB_WAIT and MB_DONTWAIT
flags was a recurring issue when porting drivers from FreeBSD because
it tended to get forgotten and the code would compile anyway with the
wrong constants. And since MB_WAIT and MB_DONTWAIT ended up as ocflags
for an objcache_get() or objcache_reclaimlist call (which use M_WAITOK
and M_NOWAIT), it was just one big converting back and forth with some
sanitization in between.

This commit allows M_* again for the mbuf functions and keeps the
sanitizing as it was before: when M_WAITOK is among the passed flags,
objcache functions will be called with M_WAITOK and when it is absent,
they will be called with M_NOWAIT. All other flags are scrubbed by the
MB_OCFLAG() macro which does the same as the former MBTOM().

Approved-by: dillon

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kernel/netgraph7: Use kprintf etc. directly instead of defining printf.

While here, remove some commented out code from dragonfly.h

In-discussion-with: nant

kernel/netgraph7: Use kether_ntoa().

kern - Utilize new way of printing MAC addresses.

kether_aton() function is being used to return a buffer
with the human readable notation of an ethernet address.

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

panic() itself will add a newline.

Welcome ng_bridge.

And also add netgraph7 include files to the Makefile. These somehow
were omited in the previous commit.