Remove tests for non-existing SimpleScheduler

The test class removed actually being an exact copy of the above
MultiDriverTestCase.

Change-Id: Id2c4141a7da8475e44d534d2e61ae83bf532d980
Correct spelling of quantum

Change-Id: Icc0a69178da13f4679b594b50e3a980ba9ec19bd
Merge "Remove tests for non-existing SimpleScheduler"
Merge "Correct spelling of quantum"