Divide policy into public and private components.  This is the first
step in splitting the policy creation for platform and non-platform
policies.  The policy in the public directory will be exported for use
in non-platform policy creation.  Backwards compatibility with it will
be achieved by converting the exported policy into attribute-based
policy when included as part of the non-platform policy and a mapping
file will be maintained to be included with the platform policy that
maps exported attributes of previous versions to the current platform
version.

Eventually we would like to create a clear interface between the
platform and non-platform device components so that the exported policy,
and the need for attributes is minimal.  For now, almost all types and
avrules are left in public.

Test: Tested by building policy and running on device.

Change-Id: Idef796c9ec169259787c3f9d8f423edf4ce27f8c

(cherry picked from commit 88c51465)

Allow the otapreopt rename script to read file attributes. This is
being used to print the aggregate artifact size for diagnostic
purposes.

Bug: 30832951
Change-Id: Iee410adf59dcbb74fa4b49edb27d028025cd8bf9

(cherry picked from commit eb717421)

The new A/B OTA artifact naming scheme includes the target slot so
that the system is robust with respect to unexpected reboots. This
complicates the renaming code after reboot, so it is moved from the
zygote into a simple script (otapreopt_slot) that is hooked into
the startup sequence in init.

Give the script the subset of the rights that the zygote had so that
it can move the artifacts from /data/ota into /data/dalvik-cache.
Relabeling will be done in the init rc component, so relabeling
rights can be completely removed.

Bug: 25612095
Bug: 28069686
Change-Id: Iad56dc3d78ac759f4f2cce65633cdaf1cab7631b

Allow the otapreopt rename script to read file attributes. This is
being used to print the aggregate artifact size for diagnostic
purposes.

Bug: 30832951
Change-Id: Iee410adf59dcbb74fa4b49edb27d028025cd8bf9

The new A/B OTA artifact naming scheme includes the target slot so
that the system is robust with respect to unexpected reboots. This
complicates the renaming code after reboot, so it is moved from the
zygote into a simple script (otapreopt_slot) that is hooked into
the startup sequence in init.

Give the script the subset of the rights that the zygote had so that
it can move the artifacts from /data/ota into /data/dalvik-cache.
Relabeling will be done in the init rc component, so relabeling
rights can be completely removed.

Bug: 25612095
Bug: 28069686
Change-Id: Iad56dc3d78ac759f4f2cce65633cdaf1cab7631b