Release version 2.1 of the libgen tool

Change-Id: I8a946aaf38374e9da4fa770a7a493799e7253e0d
diff --git a/tools/build/bazel/generate_workspace.bzl b/tools/build/bazel/generate_workspace.bzl
index 6330fcb..c5a483f 100644
--- a/tools/build/bazel/generate_workspace.bzl
+++ b/tools/build/bazel/generate_workspace.bzl
@@ -1,4 +1,4 @@
-# ***** This file was auto-generated at Tue, 27 Nov 2018 19:36:00 GMT. Do not edit this file manually. *****
+# ***** This file was auto-generated at Tue, 27 Nov 2018 20:43:43 GMT. Do not edit this file manually. *****
 # ***** Use onos-lib-gen *****
 
 load("//tools/build/bazel:variables.bzl", "ONOS_GROUP_ID", "ONOS_VERSION")