Clean up & add unit tests

Developing a set of python unit tests to have a good coverage of all the DaVinci configuration scripts. As natural consequence, a clean up of the codes is also performed removing typos and simplifying the code when needed.

Addresses: https://gitlab.cern.ch/lhcb-dpa/project/-/issues/179, https://gitlab.cern.ch/lhcb-dpa/project/-/issues/180

Phys/DaVinci/tests/config/test_configOptions.py

@@ -11,6 +11,7 @@
 
 import pytest
 
+from DaVinci.optionChecker import DVOptionError, DVRuntimeError
 from DaVinci.configOptions import (list_data_options, set_option_value, get_option_value,
                                    set_input_file_options, set_job_options, check_options,
                                    is_option_settable)