Only ship one /usr/bin/openstack
    
    https://fedoraproject.org/wiki/Packaging:Python_Appendix#Executables_in_.2Fusr.2Fbin
    
    > If the executables provide the same functionality independent of
    > whether they are run on top of Python 2 or Python 3, then only
    > the Python 3 version of the executable SHOULD be packaged, the
    > python2 version MUST NOT be packaged.