test-conversion: convert test-blacklist to new infrastructure

Add a modprobe.conf with some blacklist entries in a test rootfs, and
then ensure our blacklist function actually cuts out the two listed
entries (and doesn't cut out the others).
diff --git a/Makefile.am b/Makefile.am
index ab3dd4c..416672e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -161,7 +161,7 @@
 
 TESTSUITE = testsuite/test-init testsuite/test-testsuite testsuite/test-loaded \
 	    testsuite/test-modinfo testsuite/test-alias testsuite/test-new-module \
-	    testsuite/test-modprobe
+	    testsuite/test-modprobe testsuite/test-blacklist
 check_PROGRAMS = $(TESTSUITE)
 TESTS = $(TESTSUITE)
 
@@ -179,6 +179,8 @@
 testsuite_test_new_module_CPPFLAGS = $(TESTSUITE_CPPFLAGS)
 testsuite_test_modprobe_LDADD = $(TESTSUITE_LDADD)
 testsuite_test_modprobe_CPPFLAGS = $(TESTSUITE_CPPFLAGS)
+testsuite_test_blacklist_LDADD = $(TESTSUITE_LDADD)
+testsuite_test_blacklist_CPPFLAGS = $(TESTSUITE_CPPFLAGS)
 
 testsuite-distclean:
 	-find testsuite/rootfs-dirty -type d -exec chmod +w {} \;