This policy enforce a simple physical cluster capacity constraints, by
 * validating that the allocation proposed fits in the current plan. This
 * validation is compatible with "updates" and in verifying the capacity
 * constraints it conceptually remove the prior version of the reservation.
This policy enforce a simple physical cluster capacity constraints, by
 * validating that the allocation proposed fits in the current plan. This
 * validation is compatible with "updates" and in verifying the capacity
 * constraints it conceptually remove the prior version of the reservation. | NoOverCommitPolicy.java