Add policy for __properties__ device.

Change-Id: Ie9b391283362fb6930f1ae858f0a879835c91e32
Add a key directory argument to insertkeys.py

This allows us to better integrate key selection with our existing
build process.

Change-Id: I6e3eb5fbbfffb8e31c5edcf16f74df7c38abe537
Allow binder access from surfaceflinger to apps

This is now required for screenshots

Change-Id: Ic13a957e38f71f4d98a22c9d3cf2e36e4ce26b22
Fix adb access to its own keys directory

It needs to create and search it if it doesn't exist :)

Change-Id: Ic824a5de05d0c7ec1d8d1e40e46d25e3065c05de