added simple storage to SimpleFlowRuleManager

Change-Id: I7f9117c534673b00f2822cf90bd63d52b95d2704
diff --git a/utils/misc/src/main/java/org/onlab/packet/IpAddress.java b/utils/misc/src/main/java/org/onlab/packet/IpAddress.java
index 109672c..7669cc5 100644
--- a/utils/misc/src/main/java/org/onlab/packet/IpAddress.java
+++ b/utils/misc/src/main/java/org/onlab/packet/IpAddress.java
@@ -7,6 +7,8 @@
  */
 public final class IpAddress {
 
+    // TODO a comparator for netmasks? E.g. for sorting by prefix match order.
+
     //IP Versions
     public enum Version { INET, INET6 };
 
@@ -99,7 +101,8 @@
 
     /**
      * Converts a dotted-decimal string (x.x.x.x) into an IPv4 address. The
-     * string can also be in CIDR (slash) notation.
+     * string can also be in CIDR (slash) notation. If the netmask is omitted,
+     * it will be set to DEFAULT_MASK (0).
      *
      * @param address a IP address in string form, e.g. "10.0.0.1", "10.0.0.1/24"
      * @return an IP address