Expect tests/sys/fs/tmpfs/link_test:kqueue to fail

It fails with: "dir/b did not receive NOTE_LINK"

Also, add needed cleanup logic to cleanup the mountpoint after the fact

MFC after:	2 weeks
PR:		213662
Sponsored by:	Dell EMC Isilon

contrib/netbsd-tests/fs/tmpfs/t_link.sh

@@ -93,7 +93,18 @@ subdirs_body() {
 	test_unmount
 }
 
+# Begin FreeBSD
+if true; then
+atf_test_case kqueue cleanup
+kqueue_cleanup() {
+	Mount_Point=$(pwd)/mntpt test_unmount || :
+}
+else
+# End FreeBSD
 atf_test_case kqueue
+# Begin FreeBSD
+fi
+# End FreeBSD
 kqueue_head() {
 	atf_set "descr" "Verifies that creating a link raises the correct" \
 	                "kqueue events"
@@ -102,6 +113,10 @@ kqueue_head() {
 kqueue_body() {
 	test_mount
 
+	# Begin FreeBSD
+	atf_expect_fail "fails with: dir/b did not receive NOTE_LINK - bug 213662"
+	# End FreeBSD
+
 	atf_check -s eq:0 -o empty -e empty mkdir dir
 	atf_check -s eq:0 -o empty -e empty touch dir/a
 	echo 'ln dir/a dir/b' | kqueue_monitor 2 dir dir/a