Add -stripDir and -zipToNotStrip option in merge_zips.

In some cases, we need delete META-INF dir to void mis-using some
classes files in the Java runtime.

For now, when we delete META-INF, we need keep Manifest file in the jar
since merge_zips doesn't have ability to add a default one.

Bug: b/65455145
Test: m clean && m -j

Change-Id: Iea44b1a98d348cd8df1fa7374907733b1add6935