usage-report.py references undefined property of SumoLogic class

usage-report.py references a function called ```search_and_wait```.

This fails because, the ```SumoLogic``` class has no instance method ```search_and_wait```.

See https://github.com/SumoLogic/sumologic-python-sdk/search?utf8=%E2%9C%93&q=search_and_wait

