Defines the "delegating Policy provider" / JACC 2.5
In J2SE 1.4 new methods can be used for dynamic permissions
implies() and getPermissions() methods on Policy class were added.
A replacement Policy object may accomplish this by delegating
non-javax.security.jacc policy decisions to the corresponding
default system Policy implementation class.
Defines a wrapper for the PolicyConfigurationFactory
Uses a wrapper because JACC provider factory is loaded by abstract Factory
with the system classloader.