remove the duplicate superclass of TagRouter and ConditionRouter (apa…

…che#2885)

Remove the class ConditionRouter and TagRouter implement duplicate superclass Comparable

dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/router/condition/ConditionRouter.java

@@ -42,7 +42,7 @@
  * ConditionRouter
  *
  */
-public class ConditionRouter implements Router, Comparable<Router> {
+public class ConditionRouter implements Router {
 
     private static final Logger logger = LoggerFactory.getLogger(ConditionRouter.class);
     private static Pattern ROUTE_PATTERN = Pattern.compile("([&!=,]*)\\s*([^&!=,\\s]+)");

dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/router/tag/TagRouter.java

@@ -33,7 +33,7 @@
 /**
  * TagRouter
  */
-public class TagRouter implements Router, Comparable<Router> {
+public class TagRouter implements Router {
 
     private static final Logger logger = LoggerFactory.getLogger(TagRouter.class);