Change logic of searching for rule's ID (#34)

Signed-off-by: Serguei Bezverkhi <sbezverk@cisco.com>

rule.go

@@ -114,16 +114,18 @@ func (cc *Conn) GetRuleHandle(t *Table, c *Chain, ruleID uint32) (uint64, error)
 	if err != nil {
 		return 0, fmt.Errorf("Receive: %v", err)
 	}
-	if len(reply) != 1 {
-		return 0, fmt.Errorf("Receive: Expected 1 message but got %d", len(reply))
-	}
-	rr, err := ruleFromMsg(reply[0])
+	for _, msg := range reply {
+		rr, err := ruleFromMsg(msg)
 		if err != nil {
 			return 0, err
 		}
-
+		if rr.RuleID == ruleID {
 			return rr.Handle, nil
 		}
+	}
+
+	return 0, fmt.Errorf("rule with id %d is not found", ruleID)
+}
 
 // AddRule adds the specified Rule
 func (cc *Conn) AddRule(r *Rule) *Rule {