Changing version from 1.15.0-SNAPSHOT to 2.0.0-SNAPSHOT.

Change-Id: I61a586cfc769275db78f4059a630ab0e0f87c6e7
diff --git a/core/net/src/main/java/org/onosproject/core/impl/VersionManager.java b/core/net/src/main/java/org/onosproject/core/impl/VersionManager.java
index ea5fb99..0e1f636 100644
--- a/core/net/src/main/java/org/onosproject/core/impl/VersionManager.java
+++ b/core/net/src/main/java/org/onosproject/core/impl/VersionManager.java
@@ -38,7 +38,7 @@
     private final Logger log = LoggerFactory.getLogger(getClass());
 
     private static final File VERSION_FILE = new File("../VERSION");
-    private static Version version = Version.version("1.15.0-SNAPSHOT");
+    private static Version version = Version.version("2.0.0-SNAPSHOT");
 
     @Activate
     protected void activate() {