wsdl2java tool should always use catalog to resovle the overwriten url firstly

recently there're two tests failure
org.apache.cxf.tools.wsdlto.jaxws.CodeGenBugTest.testCatalog2
org.apache.cxf.tools.wsdlto.jaxws.CodeGenBugTest.testCatalog3

those tests use catalog to overwrite a dummy url http://example.org/wsdl to the local addNumbers.wsdl, however, the current logic is check the dummy url first and if it failed then use catalog resolver, that's not a problem if
http://example.org/ doesn't exist at all, but lately there's a site http://example.org/ so get no chance to use the catalog resolver which we intend to use, so that we get those test failure.