Make `arc unit` NoseTestEngine work in a sub-dir
57f6fb59d739
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Description

Make arc unit NoseTestEngine work in a sub-dir

Summary:
D14362 didn't actually work in a subdirectory.

This globs the tests/ directory to find test_*.py, now you get
more than just a coverage report when running arc unit --everything
whether it's run from the project root or a subdirectory.

Test Plan:
ran arc unit --everything from project root and also ran it from
a sub-directory.

$ arc unit --everything
   PASS    1ms★  test_log.FilterTest.test_filter_can_invert_behavior
   PASS    1ms★  test_log.FilterTest.test_filter_filters_matching
   PASS   <1ms★  test_log.FilterTest.test_filter_filters_matching_lambda
   PASS    1ms★  test_log.FilterTest.test_filter_filters_matching_regex
   PASS    3ms★  test_log.FilterTest.test_filter_loads
   PASS    2ms★  test_log.FilterTest.test_filter_loads_filters_correctly
   PASS   <1ms★  test_log.FilterTest.test_filter_loads_supports_numeric_comparisons
   PASS    1ms★  test_log.FilterTest.test_filter_parse
   PASS    1ms★  test_log.JSONFormatterTest.test_format_includes_all_serializable_logrecord_fields
   PASS    1ms★  test_log.JSONFormatterTest.test_format_includes_exceptions_as_text
   PASS   <1ms★  test_log.JSONFormatterTest.test_format_includes_extra_fields
   PASS    1ms★  test_log.JSONFormatterTest.test_make_record
   PASS    1ms★  test_nrpe.NRPETest.test_load
   PASS   <1ms★  test_nrpe.NRPETest.test_registered_check
   PASS   <1ms★  test_nrpe.NRPETest.test_unregistered_check
   PASS   <1ms★  test_ssh.JSONOutputHandlerTest.test_accept_ignores_bad_json
   PASS   <1ms★  test_ssh.JSONOutputHandlerTest.test_accept_parses_and_logs_json_messages
   PASS   <1ms★  test_ssh.JSONOutputHandlerTest.test_lines_buffers_partial_lines
   PASS    4ms★  test_checks.ChecksConfigTest.test_custom_type
   PASS    2ms★  test_checks.ChecksConfigTest.test_load_bad_type
   PASS    5ms★  test_checks.ChecksConfigTest.test_load_valid_config
   PASS   19ms★  test_checks.ChecksExecuteTest.test_execute
   PASS  222ms   test_checks.ChecksExecuteTest.test_execute_concurrency
   PASS   18ms★  test_checks.ChecksExecuteTest.test_execute_failure
   PASS   15ms★  test_checks.ChecksExecuteTest.test_execute_timeout
   PASS   <1ms★  test_utils.UtilsTest.test_check_php_opening_tag
   PASS    3ms★  test_utils.UtilsTest.test_check_target_hosts
   PASS    1ms★  test_utils.UtilsTest.test_check_valid_json_file
   PASS   <1ms★  test_utils.UtilsTest.test_get_env_specific_filename