Drew Gottlieb <drgott@google.com> [Mon, 30 Mar 2015 10:43:52 -0700] rev 24495
manifest: make manifest.intersectfiles() internal
manifest.intersectfiles() is just a utility used by manifest.matches(), and
a future commit removes intersectfiles for treemanifest for optimization
purposes.
This commit makes the intersectfiles methods on manifestdict and treemanifest
internal, and converts its test to a more generic testMatches(), which has the
exact same coverage.