Easy install ryu

参考：Ubuntu14.04安装Ryu控制器

环境：Ubuntu 14.04 64bit

使用pip安装ryu：

// dependencies
sudo apt-get install Python-pip build-essential python-dev libxml2-dev libxslt1-dev python-paramiko python-webob python-routes

// upgrade pip 
sudo pip install -U pip six oslo.config==3.0.0 eventlet msgpack-python

// install ryu
pip install ryu

// run ryu
ryu-manager

2017.4.3