Automatic merge from submit-queue
Allow handlers earlier in a request flow to inject a UID for an object
This lets admission controllers specify a stable UID for an object prior to its creation. That lets the admission controller then record a reference to the object on another resource using that stable UID prior to the object being created. This would be a prerequisite for supporting quota reservations.
/cc @smarterclayton @lavalamp @deads2k
a0a0760027