python: Fix style issues
    
    Fix style issues:
    
    - 2 blank lines around functions and classes
    - classes at the top of the module
    - reformat to avoid long hard to read lines
    - whitespace before ','
    - whitespace after #
    - unused imports
    - unexpected indenation
    - remove blank line at end of file
    
    Signed-off-by: Nir Soffer <nsoffer@redhat.com>