Having the workload classes inherit from the abstract base class will
enforce certain methods and help the summarized output
+ Moving logger here
+ Implementing functionality to report max test time
+ Browbeat report in yaml format
+ Renaming workload base method
+ Removing an unnecessary method
+ Formatting methods in WorkloadBase
+ autopep8
Change-Id: I090a863b4b00068a48cf5d914c337e15fd5739f5
f174b67e2b