SELinux changes to check policy versions during a reload.

When deciding on which property_contexts policy to load
during a reload, an initial call is made to libselinux to
grab the correct policy index. This policy index represents
whether the /data/security or the rootfs version will
be used.

Change-Id: I4716039bb0f5ba1e961977a18350347a67969dca
Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>