lib/tst_test.c: log testing fstyp when iterating all_filesystems

So that it's more clear which test is running which saves debug time if
anything goes wrong.

Signed-off-by: Xiong Zhou <xzhou@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
diff --git a/lib/tst_test.c b/lib/tst_test.c
index b5fce33..8be1332 100644
--- a/lib/tst_test.c
+++ b/lib/tst_test.c
@@ -1044,6 +1044,8 @@
 		tst_brk(TCONF, "There are no supported filesystems");
 
 	for (i = 0; filesystems[i]; i++) {
+
+		tst_res(TINFO, "Testing on %s", filesystems[i]);
 		tdev.fs_type = filesystems[i];
 
 		prepare_device();