Implement service-ref/wsdl-override parsing

Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[22,5]
Message: Unexpected element 'wsdl-override' encountered
at org.jboss.metadata.parser.util.MetaDataElementParser.unexpectedElement(MetaDataElementParser.java:109)
at org.jboss.metadata.parser.ee.ServiceReferenceMetaDataParser.parse(ServiceReferenceMetaDataParser.java:127)
at org.jboss.metadata.parser.ee.EnvironmentRefsGroupMetaDataParser.parse(EnvironmentRefsGroupMetaDataParser.java:81)
at org.jboss.metadata.parser.jbossweb.JBossWebMetaDataParser.parse(JBossWebMetaDataParser.java:108)
at org.jboss.as.web.deployment.JBossWebParsingDeploymentProcessor.deploy(JBossWebParsingDeploymentProcessor.java:64)
... 6 more