Test and fix bug checking status of secondary multidex files.

We were accidentally returning 'false' instead of 'true' to indicate a native
multidex file with an up-to-date primary dex file checksum but out-of-date
secondary dex file checksum is out of date.

Bug: 21022815
Change-Id: I43d360ca9251d0df38ad7f8289f6ef339c0a3280
diff --git a/test/MultiDexModifiedSecondary/main.list b/test/MultiDexModifiedSecondary/main.list
new file mode 100644
index 0000000..44ba78e
--- /dev/null
+++ b/test/MultiDexModifiedSecondary/main.list
@@ -0,0 +1 @@
+Main.class