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/RegionListCommand.java b/cli/src/main/java/org/onosproject/cli/net/RegionListCommand.java
index 823b956..222f992 100644
--- a/cli/src/main/java/org/onosproject/cli/net/RegionListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/RegionListCommand.java
@@ -18,7 +18,7 @@
 import org.apache.karaf.shell.commands.Argument;
 import org.apache.karaf.shell.commands.Command;
 import org.onosproject.cli.AbstractShellCommand;
-import org.onosproject.cli.Comparators;
+import org.onosproject.utils.Comparators;
 import org.onosproject.net.region.Region;
 import org.onosproject.net.region.RegionId;
 import org.onosproject.net.region.RegionService;