When reconstructing the response for findAndModify, if the oplog entry is for an update (opType='u'), there is a uassert that request does not have upsert=true - this should be removed, since upsert=true does not guarantee the request will result in an insert entry in the oplog. I saw randolph included this fix in his review for SERVER-30894, so this ticket can be closed once that is committed.

Failing retryable_writes_jscore_passthrough tests:

• find_and_modify.js
• find_and_modify4.js
• update_find_and_modify_id.js