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

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

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 | 82 +++++++++++++++++++++++++----------
 1 file changed, 59 insertions(+), 23 deletions(-)

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2.48.1