New python doesn't like '\l' escapes from the 'dot' language.

While at it improve usability of the script by employing proper argument
parsing.

v3:
 - rebase + resend

v2:
 - use mutually exclusive group instead of hardcoding it (Pavel)

Peter Krempa (3):
  scripts: render_block_graph: Fix invalid escape sequence warning with
    python 3.12
  scripts: render_block_graph: Implement proper argument parser
  scripts: render_block_graph: Avoid backtrace on error from virsh

 scripts/render_block_graph.py | 80 +++++++++++++++++++++++++----------
 1 file changed, 57 insertions(+), 23 deletions(-)

-- 
2.52.0