Add support for resource memory limit to generate kube

[andylibrian]

Addresses #7855

Steps to run:

podman container create --name test1 --memory 10Mi alpine
podman generate kube test1

Output (see the comment / note in the generated yaml):

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: "2020-10-04T14:20:48Z"
  labels:
    app: test1
  name: test1
spec:
  containers:
  - command:
    - /bin/sh
    env:
    - name: PATH
      value: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
    - name: TERM
      value: xterm
    - name: container
      value: podman
    - name: HOSTNAME
    image: docker.io/library/alpine:latest
    name: test1
    resources:
      limits:
        memory: 10Mi          # <<<-- This PR adds this

[rhatdan]

/approve
@haircommander @vrothberg @saschagrunert @zhangguanzhang @mheon PTAL

[mheon]

Can you add a TODO for adding CPU limiting support?

[andylibrian]

Added. Thanks @mheon.

[saschagrunert]

LGTM

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andylibrian, rhatdan, saschagrunert

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[rhatdan]

/lgtm