After the changes from SERVER-28221, we'll be running the "register" test in the following combinations:

• --protocol-version=1 --storage-engine=wiredTiger --read-with-find-and-modify
• --protocol-version=1 --storage-engine=wiredTiger --read-concern=linearizable
• --protocol-version=1 --storage-engine=mmapv1 --read-concern=linearizable

We should add new tasks to run the "register" test in the following combinations:

• --protocol-version=0 --storage-engine=wiredTiger --read-with-find-and-modify
• --protocol-version=0 --storage-engine=mmapv1 --read-with-find-and-modify