Deserialize:
We'll need to pass the tenantId into the IDLParserContext when parsing CursorInitialReply and CursorGetMoreReply (in getmore_cmd.cpp).

We'll have to change ValidateCursorResponse and validateResult to take in a tenantId.

Serialize:
We'll need to change the calls to nss.ns() in the find command to use NamespaceStringUtil::serialize - here and here.