[SERVER-11556] insert command does not move _id field to the front of BSON obj - MongoDB

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> db.user.insert({ x: 1, _id: 2 })

> db.user.find()

{ "_id" : 2, "x" : 1 }

> db.user.drop()

true

> db.runCommand({ insert: 'user', documents: [{ x: 1, _id: 2 }]})

{ "ok" : 1, "n" : 1 }

> db.user.find()

{ "x" : 1, "_id" : 2 }

Not sure if moving _id field to the front is the desired behavior, but eval8.js fails if we switch to using write commands because of this.

duplicates

SERVER-11656 js_small_oplog failing because master and slave collection hashes differ

related to

SERVER-11558 Update (save -- upsert:true w/_id) reorders _id field

Participants:: Eliot Horowitz, Eric Milkie, Githook User, Randolph Tan, Scott Hernandez