autoconf: use include directives instead of recursing down tests (mostly)

Only down to tests/zfs-tests/tests, but pull out C programs into the
main Makefile ‒ this means we get correct dependency tracking for all
programs (and parallelise across them)

dist diff:
  -zfs-2.1.99/tests/zfs-tests/tests/stress/
  -zfs-2.1.99/tests/zfs-tests/tests/stress/Makefile.am
  -zfs-2.1.99/tests/zfs-tests/tests/stress/Makefile.in

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13316

tests/test-runner/Makefile.am

@@ -1 +0,0 @@
-SUBDIRS = bin include

tests/test-runner/bin/Makefile.am

@@ -1,10 +0,0 @@
-CLEANFILES =
-EXTRA_DIST =
-include $(top_srcdir)/config/Substfiles.am
-
-pkgdatadir = $(datadir)/@PACKAGE@/test-runner/bin
-pkgdata_SCRIPTS = \
-	test-runner.py \
-	zts-report.py
-
-SUBSTFILES += $(pkgdata_SCRIPTS)

tests/test-runner/include/Makefile.am

@@ -1,4 +0,0 @@
-pkgdatadir = $(datadir)/@PACKAGE@/test-runner/include
-
-dist_pkgdata_DATA = \
-	logapi.shlib