More SWORD 1.3 cleanup

Removes EPrints::Sword::Utils which is a remnant of the EPrints 3.2 Sword 1.3 implementation and broken (the function referenced at line 11 does not exist). 

That it is broken is not usually evident because nothing EPrints 3.3 uses this module but can break the SWORD 1.3 (Legacy) EPM. Since this EPM also provides EPrints::Sword::Utils, if the packages are loaded core first and EPM second, it breaks basic authentication for the EPM.