Use majority write concern and remove assert in change stream tests #1980
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Summary
/change_stream/batchSize0
./change_stream/live/track_resume_token
.Background & Motivation
Using majority write concern is intended to address this observed test failure, which receives only one of two expected events.
The faulty assert removal follows mongodb/mongo-cxx-driver#1367, which made a similar change in the C++ driver test runner. I suspect the C++ tests were based off of the C driver tests.