Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Improve compatibility with recent flex from flex.sourceforge.net.

Use NO_WCAST_ALIGN for usr.sbin/ndiscvt; because this is only built for
x86, any alignment warnings can be safely ignored. Define YY_NO_INPUT
in usr.sbin/ndiscvt/inf-token.l, so no unused lex functions are defined.

MFC after: 1 week

- Handle doubled double quotes:
`"""foo"" bar"' -> `"foo" bar'
- Handle C++ style comments.

Requested by: wpaul

Clean up ndiscvt a bit (leaving out the -i flag didn't work) and add
copyrights to the inf parser files.

Add a -n flag to ndiscvt to allow the user to override the default
device name of NDIS devices. Instead of "ndis0, ndis1, etc..."
you can have "foo0, foo1, etc..." This allows you to have more than
one kind of NDIS device in the kernel at the same time.

Convert from printf() to device_printf() in if_ndis.c, kern_ndis.c
and subr_ndis.c.

Create UMA zones for ndis_packet and ndis_buffer structs allocated
on transmit. The zones are created and destroyed in the modevent
handler in kern_ndis.c.

printf() and UMA changes submitted by green@freebsd.org

Commit the ndiscvt(8) utility too. (Missed it in the last import.)