Original ticket title: "replace ReplSetTest::TestInitApplyOp2"

runs a multiInitialSyncApply with the first arg as an update oplog entry and SyncTest2 as the second, which inserts the base object of the update from arg one when shouldRetry is ran (so the document appears between the failing to apply the first time and retrying)
ensures the the update occurred

original test: https://github.com/mongodb/mongo/commit/1e4a71eb26808a828fff29ada663a7c43e0bdd9f