Go to the defining package to import a variable

Required by bazel 0.25

Change-Id: I726b7570f1cf4883b473d70fdd3934de3087493a
diff --git a/docs/BUILD b/docs/BUILD
index e382ff0..bb37e3a 100644
--- a/docs/BUILD
+++ b/docs/BUILD
@@ -1,5 +1,6 @@
 load("//tools/build/bazel:project_javadoc.bzl", "project_javadoc")
-load("//tools/build/bazel:generate_workspace.bzl", "CORE_DEPS", "ONOS_VERSION")
+load("//tools/build/bazel:generate_workspace.bzl", "CORE_DEPS")
+load("//tools/build/bazel:variables.bzl", "ONOS_VERSION")
 
 SOURCES = glob(["src/main/javadoc/doc-files/*"]) + [
     "src/main/javadoc/overview.html",