[ONOS-5485] Defining VirtualPacketProvider

Changes
1. Added VirtualPacketProvider interface

Change-Id: Id494e1e77b4991c87bf6cbc054f768596599265f
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/package-info.java b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/package-info.java
index 36cd14d..d9a74d2 100644
--- a/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/package-info.java
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/virtual/provider/package-info.java
@@ -15,6 +15,6 @@
  */
 
 /**
- * Network virtualization data models and services.
+ * Network virtualization provider interfaces and implementation.
  */
 package org.onosproject.incubator.net.virtual.provider;
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