Now we're getting somewhere! This CL starts measuring disk usage
using quotactl(), which is almost instant and has much lower impact
on flash memory lifetime.
We now grant the per-app cache GID to every launched app, and the
ContextImpl logic that creates cache directories matches the logic
down in installd.
Test: builds, boots, quota stats match manual stats
Bug: 27948817
Change-Id: Ie269a2958ce0e1c17cb74dbfecc791a5c12922cf
5eb3eb58ac