Support selinux context inside tar archive

- Fix 'media' exception:
In CWM, a bug present from the begining was preventing any path/file named media from backup on /data/media devices
This fix will only exclude /data/media path and not other media files/folders

Change-Id: I38e2a194235e6b10d6ae040b6c93497136528186
do not include dead code

Change-Id: I588fa2fe4b92fa1508699a904d2be18b83b471c6