Refactor Comparator class to break dependency of core/net on the CLI

Change-Id: I6f3165f399ab448eff5c5d2232f4b96f10ebf57e
diff --git a/cli/src/main/java/org/onosproject/cli/net/ClustersListCommand.java b/cli/src/main/java/org/onosproject/cli/net/ClustersListCommand.java
index 21c2732..fe2bfc4 100644
--- a/cli/src/main/java/org/onosproject/cli/net/ClustersListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/ClustersListCommand.java
@@ -20,7 +20,7 @@
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.google.common.collect.Lists;
 import org.apache.karaf.shell.commands.Command;
-import org.onosproject.cli.Comparators;
+import org.onosproject.utils.Comparators;
 import org.onosproject.net.topology.TopologyCluster;
 
 import java.util.Collections;