Add test case for pbench scheduler crash
Add test case for pbench scheduler crash

It was crashing when ramp-up wasn't specified.

greyfenrir/taurus,greyfenrir/taurus,Blazemeter/taurus,itaymendel/taurus,itaymendel/taurus,greyfenrir/taurus,Blazemeter/taurus,Blazemeter/taurus,greyfenrir/taurus,itaymendel/taurus,greyfenrir/taurus,greyfenrir/taurus,Blazemeter/taurus,Blazemeter/taurus,greyfenrir/taurus,Blazemeter/taurus,itaymendel/taurus,itaymendel/taurus,Blazemeter/taurus,greyfenrir/taurus,greyfenrir/taurus,Blazemeter/taurus,Blazemeter/taurus