Allow fedpkg to be compatible with both bodhi 1 and bodhi 2.
    
    This commit modified fedpkg to detect the installed version of the
    bodhi CLI, and then use the appropriate bodhi command to create
    the update.
    
    This will allow fedpkg to be installed on a variety of OS versions
    with differing bodhi client versions.
    
    Signed-off-by: Randy Barlow <randy@electronsweatshop.com>