WSDL 2.0 testing for Addressing Metadata

Jonathan updated the handling for Addressing Metadata in the WSDL 2.0
test suite to match the latest Metadata document. He updated
WSAddressing-1G testcase and wsdl-xslt to provide support. The support
is limited since we don't have a full WS-Policy engine.

I added the necessary support for WS-Addressing metadata in
results-messages; it even does the merge to calculate the effective
policy applicable to each message.

It now generates some nice assertions such as:

<assertion>/l:log/l:message[@number="1"]/l:content/soap12:Envelope/soap:Header/wsa:To</assertion>    <assertion>/l:log/l:message[@number="1"]/l:content/soap12:Envelope/soap:Header/wsa:Action="http://example.org/wsaTestService2/wsaTestI
nterface/echoRequest"</assertion>

I didn't add the support for ref params in EPR. And
generate-message-properties has a limitation: it doesn't take into
account the extensions applied to the service component element (one
could attach a policy to it). Adding such support would required a bit
of changes that I don't think it's worth doing for the moment.

Philippe