Line up descriptions for better code readability
    
    Multi-line descriptions of fedpkg commands were lined up to
    the beginning of the line and it was not so readable. textwrap.dedent
    was used to line descriptions up like normal string literals.
    Width of the description column was originally 70 characters, with
    this change you need to add a fixed number of spaces
    on the beginning.
    
    Signed-off-by: Ondrej Nosek <onosek@redhat.com>