run: Add --no-cleanup option

For debugging purposes, not cleaning up env files,
test tmp files and aexpect tmp files might be desirable.
So add this option to our test runner.

CC: Lukas Doktor <ldoktor@redhat.com>
Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #1226 from autotest/no-cleanup-run-opt

run: Add --no-cleanup option