Add a least-requested priority function

Actually I think it is:

(Sum(requestedCPU) / Capacity * 100 + Sum(requestedMemory) / Capacity * 100) / 2
(Sum(requestedCPU) / Capacity * 50 + Sum(requestedMemory) / Capacity * 50)
(Sum(requestedCPU) / Capacity + Sum(requestedMemory) / Capacity) * 50