But not install them.
This prevents "make tests" polluting system.img or userdata.img.
We have new mechanism to build and package up modules into zip file in
build/core/tasks/tools.
Change package-modules.mk to install DATA/ instead of data/ in the
zip file; Better handle of module name conflicting.
Bug: 13585955
Change-Id: I7586a8c7995b984c9ead0ba2fa84dd5d2dd20bd1