Print captured output before failing.

Print captured output before failing.

* tests/acloca14.test, tests/acloca17.test, tests/acloca18.test,
tests/aclocal.test, tests/acsilent.test, tests/alpha.test,
tests/check4.test, tests/color.test, tests/fn99.test,
tests/fn99subdir.test, tests/help.test, tests/init.test,
tests/lisp8.test, tests/missing3.test, tests/pr220.test,
tests/python11.test, tests/python4.test, tests/python5.test,
tests/unused.test, tests/version8.test: When Exit is called
after a command that has stdout or stderr redirected to a file
for later inspection, output the file before failing the test.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>