testsuite: simplify Makefile drivers
It was reported that "make installcheck" broke with commit
218c26a523816. Investigation pointed at quoting mishaps somewhere in
the Makefile machinery related to parallel / partial testsuite runs.
While this logic was clever and appeared useful for a time, it seems
fragile in practice and not in active use after all. So let's nuke
all of it.
Moved the environment_sanity.exp test into the systemtap/ subdirectory
to apprx. guarantee that it's run first, no Makefile magic needed. It
still exits dejagnu entirely if it fails.
git://sourceware.org / systemtap.git / commit