Avoid direct use of xmlReadFile.
Avoid direct use of xmlReadFile.

This also changes the oval_result_* structure from array
to oscap_htable. The manipulation is easier and more
straight forward. Additionally, this will allow us to
pass xccdf_session->oval.result_sources directly here.

openprivacy/openscap,ybznek/openscap,OpenSCAP/openscap,openprivacy/openscap,OpenSCAP/openscap,ybznek/openscap,postfix/openscap,jan-cerny/openscap,mpreisler/openscap,isimluk/openscap,mpreisler/openscap,ybznek/openscap,Hexadorsimal/openscap,mpreisler/openscap,redhatrises/openscap,jan-cerny/openscap,jan-cerny/openscap,Hexadorsimal/openscap,openprivacy/openscap,Hexadorsimal/openscap,redhatrises/openscap,isimluk/openscap,jan-cerny/openscap,openprivacy/openscap,mpreisler/openscap,openprivacy/openscap,redhatrises/openscap,isimluk/openscap,redhatrises/openscap,Hexadorsimal/openscap,postfix/openscap,jan-cerny/openscap,Hexadorsimal/openscap,isimluk/openscap,redhatrises/openscap,mpreisler/openscap,postfix/openscap,OpenSCAP/openscap,postfix/openscap,OpenSCAP/openscap,mpreisler/openscap,ybznek/openscap,isimluk/openscap,openprivacy/openscap,redhatrises/openscap,OpenSCAP/openscap,postfix/openscap,ybznek/openscap,OpenSCAP/openscap,postfix/openscap,jan-cerny/openscap,Hexadorsimal/openscap,isimluk/openscap,ybznek/openscap