Jeffrey Zhang c0fd4389c6 Move graphviz dependency to test stage
Graphviz is only helpful and used for developer. It is useless for
deployment. So move it to test-requirements.txt file and warning users
when he wants to save dependency feature.

TrivialFix

Change-Id: Id8de76baa6f1455ad032abe4738d9779cf0cc5a6
2016-10-13 02:14:31 +08:00
..
2016-06-07 16:40:16 +00:00