Multi-user external storage support.

Emulated external storage always has multi-user support using paths
like "/data/media/<user_id>".  Creates and destroys these paths along
with user data.  Uses new ensure_dir() to create directories while
always ensuring permissions.

Add external storage mount mode to zygote, supporting both single-
and multi-user devices.  For example, devices with physical SD cards
are treated as single-user.  Begin migrating to mount mode instead
of relying on sdcard_r GID to enforce READ_EXTERNAL_STORAGE.

Bug: 6925012
Change-Id: I9b872ded992cd078e2c013567d59f9f0032ec02b