Artyom Lukianov abb94bec51 memory manager: implement the memory manager static policy ...

- The `Allocate` method will try to allocate the memory according to the affinity hints
  saved under the `TopologyManager` store. If the store does not have any hints for the memory
  it will call `getDefaultHint` to get the default hint. If the affinity does not satisfy
  the memory request, it will call `extendTopologyManagerHint` to extend the topology hint to
  satisfy the memory request. Once it has the preferred hint, it will allocate the memory and
  update the the memory manager state accordingly.

- The `RemoveContainer` will release the allocated memory and update the memory manager state accordingly.

- The `GetTopologyHints` method will try to re-generate topology hints when the container already presents
  under the memory manager state. If it does not present it will call `calculateHints` to get topology hints.
  The `calculateHints` uses an approach similar to the one used under the CPU manager:
  1. If the container memory request can be satisfied by the single NUMA node, it will not allocate the memory from
     more than one NUMA node and it will set only single NUMA hints as the preferred one.
     It can affect the density, but it gives us guarantees regarding the NUMA alignment.
  2. The NUMA node used in the multi NUMA assignment can not be used in the single NUMA assignment.
     And the NUMA node used in the single NUMA assignment can not be used in the multi NUMA assignment.
  3. Only hints with NUMA node that have enough memory will be returned.

Signed-off-by: Artyom Lukianov <alukiano@redhat.com>

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..

state

memory manager: provide unittest for the state package

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fake_memory_manager.go

memory manager: add fake memory manager

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memory_manager_test.go

memory manager: validate reserved-memory against Node Allocatable

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memory_manager.go

memory manager: implement the memory manager static policy

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policy_none.go

memory manager: add the policy interface

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policy_static.go

memory manager: implement the memory manager static policy

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policy.go

memory manager: add the policy interface

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