The current codes to skip test cases are logically correct, but they
do not work correctly in reality. It does skip the tests as the command
line argument specifies, but the related information is wrong.
e.g.
$ oe-selftest -R archiver bblayers runtime_test
2019-06-17 09:24:53,764 - oe-selftest - WARNING - meta-selftest layer not found in BBLAYERS, adding it
2019-06-17 09:25:06,309 - oe-selftest - INFO - Adding layer libraries:
2019-06-17 09:25:06,310 - oe-selftest - INFO - /buildarea5/chenqi/SWAT/poky/meta/lib
2019-06-17 09:25:06,310 - oe-selftest - INFO - /buildarea5/chenqi/SWAT/poky/meta-yocto-bsp/lib
2019-06-17 09:25:06,310 - oe-selftest - INFO - /buildarea5/chenqi/SWAT/poky/meta-selftest/lib
2019-06-17 09:25:06,312 - oe-selftest - INFO - Running bitbake -e to test the configuration is valid/parsable
2019-06-17 09:25:10,521 - oe-selftest - INFO - Adding: "include selftest.inc" in /buildarea5/chenqi/SWAT/poky/build-selftest/conf/local.conf
2019-06-17 09:25:10,521 - oe-selftest - INFO - Adding: "include bblayers.inc" in bblayers.conf
2019-06-17 09:25:10,522 - oe-selftest - INFO - test_archiver_allows_to_filter_on_recipe_name (archiver.Archiver)
2019-06-17 09:25:10,522 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "runtime_test"'
2019-06-17 09:25:10,522 - oe-selftest - INFO - Skip by the command line argument "runtime_test"
2019-06-17 09:25:10,523 - oe-selftest - INFO - test_archiver_filters_by_type (archiver.Archiver)
2019-06-17 09:25:10,523 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "runtime_test"'
2019-06-17 09:25:10,523 - oe-selftest - INFO - Skip by the command line argument "runtime_test"
The archiver.Archiver.xxx tests should be skipped by 'archiver' command line
argument, not 'runtime_test'.
Change to use a function generator to achieve the desired effect. After the change,
the effect is as follows.
$ oe-selftest -R archiver bblayers runtime_test
2019-06-17 09:19:06,223 - oe-selftest - WARNING - meta-selftest layer not found in BBLAYERS, adding it
2019-06-17 09:19:19,598 - oe-selftest - INFO - Adding layer libraries:
2019-06-17 09:19:19,599 - oe-selftest - INFO - /buildarea5/chenqi/SWAT/poky/meta/lib
2019-06-17 09:19:19,599 - oe-selftest - INFO - /buildarea5/chenqi/SWAT/poky/meta-yocto-bsp/lib
2019-06-17 09:19:19,599 - oe-selftest - INFO - /buildarea5/chenqi/SWAT/poky/meta-selftest/lib
2019-06-17 09:19:19,602 - oe-selftest - INFO - Running bitbake -e to test the configuration is valid/parsable
2019-06-17 09:19:24,368 - oe-selftest - INFO - Adding: "include selftest.inc" in /buildarea5/chenqi/SWAT/poky/build-selftest/conf/local.conf
2019-06-17 09:19:24,368 - oe-selftest - INFO - Adding: "include bblayers.inc" in bblayers.conf
2019-06-17 09:19:24,369 - oe-selftest - INFO - test_archiver_allows_to_filter_on_recipe_name (archiver.Archiver)
2019-06-17 09:19:24,369 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "archiver"'
2019-06-17 09:19:24,369 - oe-selftest - INFO - Skip by the command line argument "archiver"
2019-06-17 09:19:24,369 - oe-selftest - INFO - test_archiver_filters_by_type (archiver.Archiver)
2019-06-17 09:19:24,370 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "archiver"'
2019-06-17 09:19:24,370 - oe-selftest - INFO - Skip by the command line argument "archiver"
2019-06-17 09:19:24,370 - oe-selftest - INFO - test_archiver_filters_by_type_and_name (archiver.Archiver)
2019-06-17 09:19:24,370 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "archiver"'
2019-06-17 09:19:24,371 - oe-selftest - INFO - Skip by the command line argument "archiver"
2019-06-17 09:19:24,371 - oe-selftest - INFO - test_archiver_srpm_mode (archiver.Archiver)
2019-06-17 09:19:24,371 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "archiver"'
2019-06-17 09:19:24,372 - oe-selftest - INFO - Skip by the command line argument "archiver"
2019-06-17 09:19:24,372 - oe-selftest - INFO - test_bitbakelayers_add_remove (bblayers.BitbakeLayers)
2019-06-17 09:19:24,373 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "bblayers"'
2019-06-17 09:19:24,373 - oe-selftest - INFO - Skip by the command line argument "bblayers"
2019-06-17 09:19:24,373 - oe-selftest - INFO - test_bitbakelayers_createlayer (bblayers.BitbakeLayers)
2019-06-17 09:19:24,373 - oe-selftest - INFO - ... skipped 'Skip by the command line argument "bblayers"'
2019-06-17 09:19:24,374 - oe-selftest - INFO - Skip by the command line argument "bblayers"
[snip]
