Add --dump-all-members option to class2greylist.

This is being used to generate a whitelist.txt for old versions of the tree
where the current build rules don't exists.

Bug: 113506167
Test: out/host/linux-x86/bin/class2greylist -m out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes.jar
Change-Id: I317b7227d77fc1bc4c9a8b1fa7a6493e127938ab