Review Request JDK-8172808: Handle sun.security.util.Resources bundle in ResourcesMgr in the same way as AuthResources

[Mandy Chung]

Adam, Sean,

Can you review this simple fix:
  http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8172808/webrev.00/

This change updates ResourcesMgr to handle both Resources 
and AuthResources consistently.  This removes doPrivileged
block because it is not really needed.  This is covered by
an existing test, jdk/test/sun/security/util/Resources/Format.java.

I ran all core tests to verify as well.

Mandy