trema/trema — pull request #343 by masap (2014-01-15 08:52:42+00:00)
Title: Use separate packet out for learning switch C example

Currently learning switch C example sends Flow Mod with valid buffer_id.
But the style is noted as dangerous in [1].
This patch separates Flow Mod and Packet Out.

[1] https://github.com/yasuhito/trema-book/blob/master/ja/openflow_spec.re