CXX-365 Test heap1 storage engine

Tyler added it in commit e648e23ce5209aaf04c65b44ec0c2fcec01bd032, adding mongo-orchestration. It appears to be a debugging feature of GTest, which causes a core dump when the first test fails(https://code.google.com/p/googletest/wiki/AdvancedGuide#Turning_Assertion_Failures_into_Break-Points). I had to turn it off to get a list of all failing tests. I'm not certain why Tyler added it, but I don't think its behavior is desirable for everyday running tests.