tests: check status qualifier

tests: check status qualifier

This change adds 8 test cases for -e status with unfinished, failed,
none, successful, detached, and the whole set.  The test cases for
failed, successful, and the whole set use chdir(2).  Threaded test cases
for unfinished and none rely on a child thread execve'ing the lead
thread.  There are additional single-threaded tests for status=none and
status=unfinished.  The test case for detached interrupts strace while
attached to a sleeping process.

* tests/status.c: New file.
* tests/status-all.c: Likewise.
* tests/status-failed.c: Likewise.
* tests/status-detached.expected: Likewise.
* tests/status-none.c: Likewise.
* tests/status-none-threads.c: Likewise.
* tests/status-successful.c: Likewise.
* tests/status-unfinished-threads.c: Likewise.
* tests/status-unfinished.c: Likewise.
* tests/status-detached.test: New test.
* tests/status-none-threads.test: Likewise.
* tests/status-unfinished-threads.test: Likewise.
* tests/tests.h (test_status_chdir): New prototype.
* tests/.gitignore: Add status-all, status-failed, status-none,
status-none-threads, status-successful, status-unfinished,
and status-unfinished-threads.
* tests/gen_tests.in: Add status-all, status-failed, status-successful,
status-none, and status-unfinished.
* tests/pure_executables.list: Likewise.
* tests/Makefile.am (libtests_a_SOURCES): Add status.c.
(check_PROGRAMS): Add status-none-threads and status-unfinished-threads.
(status_none_threads_LDADD, status_unfinished_threads_LDADD): New
variables.
(MISC_TESTS): Add status-detached.test, status-none-threads.test, and
status-unfinished-threads.test.
(EXTRA_DIST): Add status-detached.expected.

Co-Authored-by: Burkhard Kohl <burkhard.kohl@intel.com>
Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>