testsuite: reorganize tests on TAP plans

testsuite: reorganize tests on TAP plans

* tests/tap-skip-whole.test: Rename ...
* tests/tap-planskip.test: ... to this
* tests/tap-skip-whole-badexit.test: Rename ...
* tests/tap-planskip-badexit.test: ... to this.
* tests/tap-skip-whole-bailout.test: Rename ...
* tests/tap-planskip-bailout.test: ... to this.
* tests/tap-skip-whole-bailout.test: Rename ...
* tests/tap-planskip-later-errors.test: ... to this.
* tests/tap-skip-whole-unplanned.test: Rename ...
* tests/tap-planskip-unplanned.test: ... to this.
* tests/tap-skip-whole-whitespace.test: Rename ...
* tests/tap-planskip-whitespace.test: ... to this.
* tests/tap-skip-whole-continue.test: Rename ...
* tests/tap-planskip-and-logging.test: ... to this, extend to try
more cases, and fix heading comments.
* tests/tap-skip-whole-lastline.test: Rename ...
* tests/tap-planskip-late.test: ... to this, fix heading comments,
and remove some checks that are just a duplication of those already
performed in the previous script.
* tests/tap-results-with-planskip.test: Rename to ...
* tests/tap-planskip-unplanned-corner.test: ... this, and improve
hading comments.
* tests/tap-planskip-later-errors.test: New test.
* tests/Makefile.am (tap_with_common_setup_tests): Update.