lisa.utils: Setup YAML parser on demand
YAML parser instances seem to not be reentrant anymore on Python 3.8. Fix the reentrance issue by creating a new fresh parser instance each time it is needed rather than recycling an existing one.
YAML parser instances seem to not be reentrant anymore on Python 3.8. Fix the reentrance issue by creating a new fresh parser instance each time it is needed rather than recycling an existing one.