Introduce bay monitor for k8s bay type

[hongbin]

See @Vilobh's inline comment:

https://review.openstack.org/#/c/215335/10/magnum/conductor/monitors.py

This bug trace the status of adding support for k8s monitor

[hongbin (hongbin034)]

To get memory size of each node:

$ kubectl get nodes -o=json
{
    "kind": "List",
    "apiVersion": "v1",
    "metadata": {},
    "items": [
        {
            "kind": "Node",
            "apiVersion": "v1",
            "metadata": {
                "name": "k8-wflf273dao-0-e2bz4sipy5lu-kube-minion-twnj5q7ycaon",
                "selfLink": "/api/v1/nodes/k8-wflf273dao-0-e2bz4sipy5lu-kube-minion-twnj5q7ycaon",
                "uid": "c5dc7b78-714c-11e5-a568-fa163ef21536",
                "resourceVersion": "48",
                "creationTimestamp": "2015-10-13T01:50:25Z",
                "labels": {
                    "kubernetes.io/hostname": "k8-wflf273dao-0-e2bz4sipy5lu-kube-minion-twnj5q7ycaon"
                }
            },
            "spec": {
                "externalID": "k8-wflf273dao-0-e2bz4sipy5lu-kube-minion-twnj5q7ycaon"
            },
            "status": {
                "capacity": {
                    "cpu": "1",
                    "memory": "2049852Ki",
                    "pods": "40"
                },
                "conditions": [
                    {
                        "type": "Ready",
                        "status": "True",
                        "lastHeartbeatTime": "2015-10-13T01:55:35Z",
                        "lastTransitionTime": "2015-10-13T01:50:25Z",
                        "reason": "kubelet is posting ready status"
                    }
                ],
                "addresses": [
                    {
                        "type": "LegacyHostIP",
                        "address": "fe80::f816:3eff:fef0:ffe1"
                    }
                ],
                "nodeInfo": {
                    "machineID": "45bb3b96146aa94f299b9eb43646eb35",
                    "systemUUID": "37DA0FEA-4309-4C20-A8E5-1AB31CFDE95E",
                    "bootID": "1481d9cc-fd33-4d4c-bb0d-13def0bc8b94",
                    "kernelVersion": "3.17.4-301.fc21.x86_64",
                    "osImage": "Fedora 21 (Twenty One)",
                    "containerRuntimeVersion": "docker://1.7.1.fc21",
                    "kubeletVersion": "v1.0.4",
                    "kubeProxyVersion": "v1.0.4"
                }
            }
        }
    ]
}

[hongbin (hongbin034)]

To get memory size of pod:

$ kubectl get pods -o=json
{
    "kind": "List",
    "apiVersion": "v1",
    "metadata": {},
    "items": [
        {
            "kind": "Pod",
            "apiVersion": "v1",
            "metadata": {
                "name": "frontend",
                "namespace": "default",
                "selfLink": "/api/v1/namespaces/default/pods/frontend",
                "uid": "d38b97a3-714e-11e5-a568-fa163ef21536",
                "resourceVersion": "130",
                "creationTimestamp": "2015-10-13T02:05:07Z"
            },
            "spec": {
                "containers": [
                    {
                        "name": "db",
                        "image": "mysql",
                        "resources": {
                            "limits": {
                                "cpu": "500m",
                                "memory": "128Mi"
                            },
                            "requests": {
                                "cpu": "250m",
                                "memory": "64Mi"
                            }
                        },
                        "terminationMessagePath": "/dev/termination-log",
                        "imagePullPolicy": "IfNotPresent"
                    },
                    {
                        "name": "wp",
                        "image": "wordpress",
                        "resources": {
                            "limits": {
                                "cpu": "500m",
                                "memory": "128Mi"
                            },
                            "requests": {
                                "cpu": "250m",
                                "memory": "64Mi"
                            }
                        },
                        "terminationMessagePath": "/dev/termination-log",
                        "imagePullPolicy": "IfNotPresent"
                    }
                ],
                "restartPolicy": "Always",
                "dnsPolicy": "ClusterFirst",
                "nodeName": "k8-wflf273dao-0-e2bz4sipy5lu-kube-minion-twnj5q7ycaon"
            },
            "status": {
                "phase": "Pending",
                "startTime": "2015-10-13T02:05:07Z"
            }
        }
    ]
}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/234817

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/234817
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=61c9017335c34c180970d5a3cdf01ffd235c827d
Submitter: Jenkins
Branch: master

commit 61c9017335c34c180970d5a3cdf01ffd235c827d
Author: Bharath Thiruveedula <email address hidden>
Date: Wed Oct 14 20:13:25 2015 +0530

    Monitor driver for k8s bay type

    Add support for computing memory utilization of k8s bay

    Change-Id: I3eecd5e9ceab77bb1877dff2229ba2eb18a5dd76
    Closes-Bug: #1500299