Recoverable Rollback: Support rolling back of dropCollection oplog entries using collection UUIDs.

The existing rollback implementation in 3.4 requires the entire collection to be copied from the sync source when rolling back a dropCollections command. With the introduction of Collection UUIDs in 3.6 and 2-phase drops in 3.6, this should no longer be necessary. We can recover the dropped collection by fixing up the Namespace to UUID links in the collection catalog.