Install vcpython27 when python.version is 2.7
Install vcpython27 when python.version is 2.7

This commit installs vcpython27 when the python version is 2.7 because
an error occurs without it like this.

 error: Microsoft Visual C++ 9.0 is required. Get it from
        http://aka.ms/vcpython27

masayukig/stestr,masayukig/stestr,mtreinish/stestr,mtreinish/stestr