Revert "CDRIVER-429 Bump maxWireProtocolVersion"

This reverts commit 757c8dfe51d38ee6a1ae69bb54377a54e4b1df78.
Revert "added validate to collection_insert_bulk; added test"

This reverts commit 9260a18a632797fd00ab844bda7d2f0df5e41c69.