OLD behaviour:
```
7:40 [0] m@devel0 s kyua list -k /usr/tests/sys/net/routing/Kyuafile test_rtsock_multipath.py
test_rtsock_multipath.py:__test_cases_list__
7:40 [0] m@devel0 s kyua test -k /usr/tests/sys/net/routing/Kyuafile test_rtsock_multipath.py
test_rtsock_multipath.py:__test_cases_list__ -> broken: Test program did not exit cleanly [0.001s]
```
NEW behaviour:
```
7:43 [1] m@devel2 s kyua list -k /usr/tests/sys/netinet6/Kyuafile test_ip6_output.py
test_ip6_output.py:__test_cases_list_pytest_binary_not_found__
7:44 [1] m@devel2 s kyua test -k /usr/tests/sys/netinet6/Kyuafile test_ip6_output.py
test_ip6_output.py:__test_cases_list_pytest_binary_not_found__ -> skipped: Required program 'pytest' not found in PATH [0.001s]
```