Set PYTHONUNBUFFERED=1 in all recipes

[ma08]

To force stdout, stderr to be unbuffered for python scripts. Without this setting, parts of the stream might be lost in a few cases. Relevant mainly for python versions <3.7.

Discussion regarding this PR in kaldi-developers Google Group : https://groups.google.com/g/kaldi-developers/c/YEJugk2J9Xw

[jtrmal]

could we just do

PYTHONUNBUFFERED=1

please? Uppercased TRUE is not nice and doesn't mesh well with neither python nor bash

[ma08]

@jtrmal Oops. Sure!

Shall I create a new PR or make changes to the existing one with a new commit?

Edit: Made a new commit using 1 instead of TRUE.

[ma08]

@jtrmal let me know if any other issues.

It's a single line change in all the files (addition of the line). Number of files changed is 139 which matches the number of path.sh file in egs

sourya4@IWeighHar:~/pro/columbia/spring22/fund_sp_rec/kaldi_fork$ find egs/ -name "path.sh" | wc -l
139

[jtrmal]

looks good, thanks!