Improvements to flows list command.

 * Added -s option which gives more succinct output.
 * Display each flow on one line for easy grepping.
 * Added ability to filter output by table ID.
 * Flows are now sorted by descending priority within a table.
 * Removed the use of toStringHelper in instructions and criterion to produce
   less verbose output.

Change-Id: I1c874c776491386488ea5a4d23627b20f1e5728b
diff --git a/core/api/src/main/java/org/onosproject/net/flow/criteria/IPEcnCriterion.java b/core/api/src/main/java/org/onosproject/net/flow/criteria/IPEcnCriterion.java
index 48b3fbf..7132043 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/criteria/IPEcnCriterion.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/criteria/IPEcnCriterion.java
@@ -17,8 +17,6 @@
 
 import java.util.Objects;
 
-import static com.google.common.base.MoreObjects.toStringHelper;
-
 /**
  * Implementation of IP ECN (Explicit Congestion Notification) criterion
  * (2 bits).
@@ -52,8 +50,7 @@
 
     @Override
     public String toString() {
-        return toStringHelper(type().toString())
-            .add("ipEcn", Long.toHexString(ipEcn)).toString();
+        return type().toString() + SEPARATOR + Long.toHexString(ipEcn);
     }
 
     @Override