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

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

In sys/contrib/ngatm/netnatm/msg/uni_ie.c, fix a few warnings from newer
versions of clang 3.2, about comparing enum uni_cause values against
integer constants which fall outside the enum range. No functional
change.

MFC after: 3 days

In sys/contrib/ngatm/netnatm/msg/uni_ie.c, use a more appropriate way to
tell the compiler some parameters are purposefully unused.

MFC after: 1 week

Properly tell the compiler that we want to ignore the return value of
certain macros.

This commit was generated by cvs2svn to compensate for changes in r146539,
which included commits to RCS files with non-trunk default branches.

Virgin import of NgATM kernel part 1.2

Virgin import of NgATM shared kernel/user part 1.1

Virgin import of NgATM share kernel/user part 1.0

Virgin import of NgATM shared kernel/user part 0.91