Code refactoring.
Working on steps.
Working on json related tests.
Working on tests for json related steps.
Removed typo from then_json_pointer_is_false finction name.
Added some tests to SQL related steps.
Finished unit test for SQL related steps.
Merge branch 'fklos-gh4-add_a_step_to_query_an_SQL_db' into fklos-gh5-add_means_to_upload_zato_tests