[wsrp] Issue #41: use wsdl rather than wsrp metadata for supportedfactories?

[Rich Thompson <richt2@us.ibm.com>]

Issue # 41
Spec section: 
SubCommittee: Interfaces
Owner: Rich
Description:
Rather than having our own metadata for supported
factories, move the new factories into additional portTypes and use WSDL
to indicate what is supported. Note, the reasons for first placing them
in the PortletManagement portType were:
1.        Encourage
their implementation as many implementations are expected to implement
this portType (for destroyPortlets if nothing else).
2.        Reduce
the explosion of portTypes