Automatic merge from submit-queue

Kubelet pod eviction proposal

The following is a proposal for how the `kubelet` may pro-actively fail a pod in response to local compute resources being starved.  The proposal focuses on memory as a first candidate, and defines a `greedy` strategy for reclaiming starved resources on the node since it seemed easiest to describe for operators versus other options and probably satisfies a broad set of use case environments.

Putting this out now for community feedback, but anticipate some more refinement around how we report eviction configuration back to users in the `Node API`.

/cc @bgrant0607 @smarterclayton @vishh @dchen1107 @kubernetes/rh-cluster-infra @kubernetes/goog-node