Enhancing portlet session management

[Eric Dalquist]

I've created https://issues.apache.org/jira/browse/PLUTO-503 and https://issues.apache.org/jira/browse/PLUTO-504 which relate to a portal's ability to extend the Pluto provided PortletSessionImpl.

-Eric

503 simply makes some private method protected to allow a subclass to change how portlet session attributes are namespaced. 504 adds a method to the PortletEnvironmentService for creating PortletSession objects and modifies the PortletRequestImpl to use this new API for creating a PortletSession if it needs one. Neither patch will change exiting behavior, just provide an additional hook for portals using Pluto. I'll be applying this to trunk, 2.0-refactoring and 1.1.x later this week unless anyone has objections.

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