Hello,
You are right since jbpm5.1 drools.xml has been renamed to jbpm.xml and it is located in designer.war\profiles.
As for the changeset.xml indeed there is only one.
Finally you'll have to also fix the address and port in the two classes (org.drools.guvnor.server.contenthandler.BPMN2ProcessHandler,org.drools.guvnor.server.GuvnorAPIServlet) of guvnor, as metnioned in that thread.