Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

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

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

Add a test for r228510.

Fix some uninitialized variables in pipe regression tests that result in
failure.

PR: misc/161175
Submitted by: gianni@
Approved by: nwhitehorn@
MFC after: 1 week

Add a simple test for pipe inode numbers reported by fstat(2).

Submitted by: gianni
MFC after: 1 week

Add two more pipe regression tests. Not yet hooked into the test framework.

Start the dreaded NOFOO -> NO_FOO conversion.

OK'ed by: core

Switch over to a different, more flexible test output protocol that's
understood by Perl's Test::Harness module and prove(1) commands.

Update README to describe the new protocol. The work's broken down into
two main sets of changes.

First, update the existing test programs (shell scripts and C programs)
to produce output in the ok/not ok format, and to, where possible, also
produce a header describing the number of tests that are expected to be
run.

Second, provide the .t files that actually run the tests. In some cases
these are copies of, or very similar too, scripts that already existed.
I've kept the old scripts around so that it's possible to verify that
behaviour under this new system (in terms of whether or not a test fails)
is identical to the behaviour under the old system.

Add a TODO file.

For variables that are only checked with defined(), don't provide
any fake value.

Add two more programs useful for testing the correctness of pipes.

Make this test compile again and remove its dependency on sys/pipe.h.

Add a simple regression test for the stat st_size bug just fixed in
sys_pipe.c

Add a regression test for the big pipe bug.

Suggested by: silby