Fix python lint check

[Vibaswan]

python do.py lint now formats the python files using black and provides information on which files changed and remained same on the out CI uses python do.py true (check=true) and prints all the files that needs reformatting and remained unchanged example CI failure due to lint issues https://github.com/open-traffic-generator/openapiart/actions/runs/5286727208/jobs/9566426810#step:6:17

Pass CI also prints that all files are good and no of unchanged files https://github.com/open-traffic-generator/openapiart/actions/runs/5286810785/jobs/9566599826#step:6:9

[ashutshkumr]

@pmajumdarKS FYI, this is addressed.