Bug: 33746484
Test: Successfully boot with original service and property contexts.
      Successfully boot with split serivce and property contexts.

Change-Id: I87f95292b5860283efb2081b2223e607a52fed04
Signed-off-by: Sandeep Patil <sspatil@google.com>

The CLs that split the property_contexts at
topic:prop_ctx_split status:merged broke incremental build,
which was later fixed in I22ecd1d3698404df352263fa99b56cb65247a23b.

The prop_ctx CLs were later reverted due to updater breakage as in
b/34370523. So, this change adds the property_contexts clean steps
to fix the incremental builds

Change-Id: Ic32b144dbfada3a6c34f9502099220e7e3c63682
Signed-off-by: Sandeep Patil <sspatil@google.com>

Some recent CLs changed the list of files that are installed in the
root directory.  Incremental builds have no way to uninstall files
that were previously installed, which results in old stray files lying
around.  If the root directory is contained in system.img, this causes
an error while building system.img:
error: build_directory_structure: cannot lookup security context for /service_contexts

Update CleanSpec.mk to remove files obsoleted by:
Ide67d37d85273c60b9e387e72fbeb87be6da306a
I7881af8922834dc69b37dae3b06d921e05206564
Ide67d37d85273c60b9e387e72fbeb87be6da306a

This is not seen on the incremental build servers because they run
make installclean between builds.

Test: incremental build passes
Change-Id: I22ecd1d3698404df352263fa99b56cb65247a23b

This change supports external/libselinux changes to implement
PCRE formatted binary file_contexts and general_file_contexts.bin
files.

The $(intermediates) directory will contain the original text file
(that is no longer used on the device) with a .tmp extension as well
as the .bin file to aid analysis.

A CleanSpec.mk file is added to remove the old file_contexts file.

Change-Id: I75a781100082c23536f70ce3603f7de42408b5ba
Signed-off-by: Richard Haines <richard_c_haines@btinternet.com>