RegistryAPI with CXF client

[mdutoo]

• DONE jgu add a test (if none yet) checking when at least 2 SoaNodeInformation are returned to client tests (Jersey, CXF, FraSCAti...)
• DONE jgu in RegistryAPI, replace SoaNodeInformation[] by SoaNodeInformations.
• DONE jgu Patch references (RemoteRepositoryInit, CodeDiscoveryRegistryClient and its use in JaxWSSourcesHandler), RegistryAPIImpl & enrich JsonMessageReader to make it work in rest client Jersey test
• DONE mdu make the Registry API client work in CXF with minimal configuration. UPDATE How it's now done : JsonMessageReader/Writer are removed, the API is terser and more cleanly supports lists & maps using Jackson which works in FraSCAti (intent) and CXF (configuration), there's also a bonus XML / JAXB API... See RegistryAPI
• DONE MDU add a test (if none yet) where an SOA node whose DocumentModel has a file:content Blob is returned, comment the content of JsonMessageWriter, check that SoaNodeInformationFactory is enough to skip the Blob and make the test work
• DONE jgu remove custom JsonMessageReader & JsonMessageWriter (from EasySOAModule Jersey configuration, but also ClientBuilder and tests : AbstractRestApiTest, RestClientTest). Make Jersey client tests work. By the way, in DashboardMatchingSample.createAuthenticatedHTTPClient(), use ClientBuilder instead.
• add RegistryAPI client tests (again : post, get(soanode) and get/query returning at least 2) for CXF and FraSCAti, make them work
• DONE jgu use said CXF client in the proxy instead of the Jersey client, check that the new CXF mock works along