Preserve container resources requested by scheduler in state manager

[ashvina]

A scheduler may request more resources than what is suggested by the packing algorithm. For e.g. the AuroraScheduler requests homogeneous containers. Currently this information is not preserved anywhere. It would be useful to retain this information. For e.g. implementations of re-packing algorithm can efficiently pack new instances if the available space is available.

I am planning to add scheduledResource to PackingPlan.ContainerPlan. A scheduler will update the packing plan in onSchedule method and replace the one in .../packingplans/ in state manager.

Required for #1292