MFC r266074,r266104,r266147:

r266074:

Move old fmake tests into bmake and hook them to the build.

This first step is mostly to prevent the code from rotting even further
and to ensure these do not get wiped when fmake's code is removed from
the tree.

These tests are currently being skipped because they detect the underlying
make is not fmake and thus disable themselves -- and the reason is that
some of the tests fail, possibly due to legitimate bugs. Enabling them to
run against bmake will come separately.

Lastly, it would be ideal if these tests were fed upstream but they are
not ready for that yet. In the interim, just put them under usr.bin/bmake/
while we sort things out. The existence of a different unit-tests directory
within here makes me feel less guilty about this.

Change confirmed working with a clean amd64 build.

r266104:

Undo changes to the generated Makefile. Move tests directory to proper
location, including updating the test to work in the more-fragile
fmake -> bmake bootstrap environment.

r266147:

Makefile.inc is also included by the tests subdirectory, which results
in SUBDIRS having tests added to it, which fails. Work around this by
checking to make sure tests exists before adding it to subdirs and
work to get the generated file fixed so we can rename Makefile.inc to
something else so it isn't automatically included by subdirs...

Move old fmake tests into bmake and hook them to the build.

This first step is mostly to prevent the code from rotting even further
and to ensure these do not get wiped when fmake's code is removed from
the tree.

These tests are currently being skipped because they detect the underlying
make is not fmake and thus disable themselves -- and the reason is that
some of the tests fail, possibly due to legitimate bugs. Enabling them to
run against bmake will come separately.

Lastly, it would be ideal if these tests were fed upstream but they are
not ready for that yet. In the interim, just put them under usr.bin/bmake/
while we sort things out. The existence of a different unit-tests directory
within here makes me feel less guilty about this.

Change confirmed working with a clean amd64 build.

Migrate tools/regression/usr.bin/make/ to the new tests layout.

Note that these tests are for fmake, not bmake, and thus they are not
installed nor run when bmake is selected (the default). Yes, I have
wasted a *ton* of time on moving tests for no real reason other than
ensuring they are not left behind.

But maybe, just maybe, it was not work in vain: the majority of these
tests also work with bmake and the few that don't may point at broken
stuff. For example, the tests for the "archive" feature do not work
with bmake, but bmake's manpage and source tree seem to imply that they
should. So... to be investigated later; need to poke sjg@.

Spelling fixes for tools/

Add some $FreeBSD$ tags so svn will allow the commit.

Add support for TODO tests. These are tests that are supposed to fail,
because of a make bug that should be fixed.

Change the test infrastructure so that tests are easier to maintain and
so that make(1) will run in an almost clean environment and enhance the
description of the test infrastructure.

Add the ability to have multiple tests carried out per test script.

Give some tests more meaningful names.

Fix the usage message from the test scripts.

Make it possible to pass several commands to the test scripts like:
'sh test.t setup run compare clean'.

Add an initial regression test suite for make(1).

Submitted by: Max Okumoto <okumotu@ucsd.edu> (partly, initial version)