log_remote_op_wait.js misuses rawMongoProgramOutput

On the v4.2 branch, log_remote_op_wait.js uses the rawMongoProgramOutput() function to assert that a query produces the right log line. But rawMongoProgramOutput() doesn't necessarily include the log line, even though the server did write it, and the client did receive the response. The problem is that the command response and the log line happen over two different channels (the network, vs a background thread reading from a pipe).

It looks like other jstests fix this by shutting down the server before checking rawMongoProgramOutput(); that should work here too.

This only affects the v4.2 branch. Originally log_remote_op_wait.js used the getLog command, but when backporting the test to 4.2 we switched one assertion to rawMongoProgramOutput to overcome the log-line length limit of getLog.