How to set OL HUB Logging level

There are two levels of logging configuration:

Logging level for hub components and services:
Can be controlled by environment variable HUB_LOGGING_LEVEL (default: INFO)
Logging level of hub core/ DTF components
Can be controlled by environment variable OL_LOGGING_LEVEL (default: INFO)
This is very useful to debug errors in test flow/ test asset/ test connection issues and also parsing error issues.