ONOS-885: Group store interface definition and in-memory store implementation

Change-Id: I1125fbc23f1e58bcb8aaf5f67c02da610fa7ef25

ONOS-885: Group store interface definition and in-memory store implementation

Change-Id: Id3794bed63785e10ed86c0b5d90bf875d127224c
diff --git a/core/api/src/main/java/org/onosproject/net/group/GroupDescription.java b/core/api/src/main/java/org/onosproject/net/group/GroupDescription.java
index e4ae7ed..74dcb16 100644
--- a/core/api/src/main/java/org/onosproject/net/group/GroupDescription.java
+++ b/core/api/src/main/java/org/onosproject/net/group/GroupDescription.java
@@ -47,35 +47,35 @@
     }
 
     /**
-     * Return type of a group object.
+     * Returns type of a group object.
      *
      * @return GroupType group type
      */
     public Type type();
 
     /**
-     * Return device identifier on which this group object is created.
+     * Returns device identifier on which this group object is created.
      *
      * @return DeviceId device identifier
      */
     public DeviceId deviceId();
 
     /**
-     * Return application identifier that has created this group object.
+     * Returns application identifier that has created this group object.
      *
      * @return ApplicationId application identifier
      */
     public ApplicationId appId();
 
     /**
-     * Return application cookie associated with a group object.
+     * Returns application cookie associated with a group object.
      *
      * @return GroupKey application cookie
      */
     public GroupKey appCookie();
 
     /**
-     * Return group buckets of a group.
+     * Returns group buckets of a group.
      *
      * @return GroupBuckets immutable list of group bucket
      */