awaitdata_getmore_cmd.js can be a flaky test. It issues getMore with awaitData to local.oplog.rs and expects to eventually get an empty batch after time out. However, when run in parallel with other tests, the other tests can perform operations that are appended to the oplog. If we cross maxTimeMS, and we still have not found an empty batch, this test will time out.

We should instead issue the original find and subsequent getMores to the oplog with a filter on a specific namespace.