将 install_rally.sh 脚本中 pip 的源改为 http://pypi.mirrors.ustc.edu.cn/
将 install_rally.sh 脚本中 pip 的源改为 http://pypi.mirrors.ustc.edu.cn/

Signed-off-by: CoffeeChou <27af2d31cca7aebdd43134087c21fbcbed32b54c@gmail.com>

eayunstack/rally,eayunstack/rally,eayunstack/rally