Changing version from 1.15.0-SNAPSHOT to 2.0.0-SNAPSHOT.

Change-Id: I61a586cfc769275db78f4059a630ab0e0f87c6e7
diff --git a/BUILD b/BUILD
index d57e442..69e31ee 100644
--- a/BUILD
+++ b/BUILD
@@ -1,4 +1,4 @@
-load("//tools/build/bazel:generate_workspace.bzl", "ONOS_VERSION")
+load("//tools/build/bazel:variables.bzl", "ONOS_VERSION")
 load(":modules.bzl", "APPS", "CORE", "FEATURES")
 
 filegroup(