<socket-binding-group name="standard-sockets" default-interface="public">
should become
<socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.default.port-offset:0}">

<native-interface interface="management" port="${jboss.native.managementport:9999}"/>
<http-interface interface="management" port="${jboss.http.managementport:9990}"/>