Provide mapping from jboss.server.temp.dir to jboss.server.tmp.dir

In AS6 and earlier, the property for the server tmp directory was called jboss.server.temp.dir. The current controller/src/main/resources/schema/jboss_7_0.xsd and controller/src/main/java/org/jboss/as/controller/parsing/CommonXml.java equivalent is called jboss.server.tmp.dir. We should either provide a mapping from the legacy name to the current one, or change the current one back to jboss.server.temp.dir.