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/HostsListCommand.java b/cli/src/main/java/org/onosproject/cli/net/HostsListCommand.java
index a90627e..8fd12ba 100644
--- a/cli/src/main/java/org/onosproject/cli/net/HostsListCommand.java
+++ b/cli/src/main/java/org/onosproject/cli/net/HostsListCommand.java
@@ -20,7 +20,7 @@
 
 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.Host;
 import org.onosproject.net.host.HostService;