Fix exit status

This MR fixes the problematic situation encountered in !109 (merged) where Gen_tf failed but run_athena and check_logParser returned success. This was because of the set +e flag that is set early in the CI scripts.

Bug fixes:

• Use set -e before running Gen_tf.py so that any error in the execution of the transform immediately makes the pipeline to fail: This pipeline shows the result and is what Matthew would have obtained in his MR
• Catch errors in the exectution of logParser from check_logParser and make the associated job fail

Improvements:

• Take number of events to run from jO in the run_athena job (Closes #49 (closed))

There is still a bug in check_jo_consistency.py as described in #50 (closed) which needs to be fixed in athena (tagging @pengc @ewelina)