Add selinux policies for init script and shell script to unzip a tar
containing ASAN libraries on boot.

Bug: 36458146
Test: m && m SANITIZE_TARGET=address
Test: manual (build steps for tar missing)
Change-Id: I5c3cb233aae93ee9985431090af902b0e3c1b0a7
(cherry picked from commit 0b743050)
Merged-In: I5c3cb233aae93ee9985431090af902b0e3c1b0a7

This CL changes the policy for ASAN files on-disk to support the
changes made by the following CLs -
https://android-review.googlesource.com/#/c/359087/
https://android-review.googlesource.com/#/c/359389/

which refactor the on-disk layout of sanitized libraries in the following
manner -
/data/lib* --> /data/asan/system/lib*
/data/vendor/* --> /data/asan/vendor/*

There are a couple of advantages to this, including better isolation
from other components, and more transparent linker renaming and
SELinux policies.

(cherry picked from commit 33ebdda8)

Bug: 36574794
Bug: 36674745
Test: m -j40 && SANITIZE_TARGET="address" m -j40 and the device
boots. All sanitized libraries are correctly located in /data/asan/*,
and have the right SELinux permissions.

Change-Id: Ib08e360cecc8d77754a768a9af0f7db35d6921a9

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

This policy takes effect only when building with
SANITIZE_TARGET=address and allows the Zygote to load libraries from
/data. That's where ASan-instrumented copies of system libraries are
located. 32-bit library directories have been added a while back;
this CL extends the same policy to 64-bit directories.

Bug: 25751174
Bug: 28680288

(cherry picked from commit dda55908)

Change-Id: Ieb4701b78db9649ec8563f2962a69db537ae61b3

This policy takes effect only when building with
SANITIZE_TARGET=address and allows the Zygote to load libraries from
/data. That's where ASan-instrumented copies of system libraries are
located. 32-bit library directories have been added a while back;
this CL extends the same policy to 64-bit directories.

Bug: 25751174

Change-Id: Ieb4701b78db9649ec8563f2962a69db537ae61b3

This is in addition to /data/lib.
Only affects SANITIZE_TARGET=address builds.

Bug: 21785137
Change-Id: Id1983cabb9479ae2d38fb23691de3eba236fe9cb

SANITIZE_TARGET adds shared libraries in /data/lib.

Bug: 21785137
Change-Id: I8ac3d059d88d57d24ed762ffc6202a4ce5a42333