drop python2.6 support

The Python core team[*1] stopped supporting python 2.6. Some Python
libraries started following the same path and trying to support 2.6
becomes painful...

For example, most of you already noticed, oslo.config dropped 2.6
support. I tried to work around it with the following commit:

https://github.com/osrg/ryu/commit/22501710983fb79a8a337e6bf650821efdc7cf59

But this forces users of decent distributions (e.g Ubuntu 14.04) to
upgrade pip (old pip versions can't understand version conditions).

[*1]
http://www.curiousefficiency.org/posts/2015/04/stop-supporting-python26.html

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

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