Extend to check indirect allow rules and conditional rules.

$ sepolicy-check -s untrusted_app -t mediaserver -c binder -p call -P out/target/product/manta/root/sepolicy
Match found!

Also removed loading of initial SIDs as that is not required for
this functionality and it leaks memory as it is never freed.
valgrind now reports no leaks.

Change-Id: Ic7a26fd01c57914e4e96db504d669f5367542a35
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>