btrfs-progs: add fsck-tests/067-log-csum-already-present

Adds a test that btrfs check doesn't report an error because of a
missing csum entry in the log tree, if that csum is already in the
normal csum tree. See commit 6c7d2a3.

Signed-off-by: Mark Harmstone <maharmstone@fb.com>

tests/fsck-tests/067-log-csum-already-present/test.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+#
+# Verify that check doesn't report a missing log csum item if it's already
+# in the main tree.
+
+source "$TEST_TOP/common" || exit
+
+check_prereq btrfs
+
+check_image() {
+	run_check "$TOP/btrfs" check "$1"
+}
+
+check_all_images