feat(charts): Adding chaos charts for node-memory-hog experiment (#163)

* feat(charts): Adding chaos charts for node-memory-hog experiment

Signed-off-by: Udit Gaurav <uditgaurav@gmail.com>

charts/generic/node-memory-hog/engine.yaml

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+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: nginx-chaos
+  namespace: default
+spec:
+  # It can be true/false
+  annotationCheck: 'false'
+  # It can be active/stop
+  engineState: 'active'
+  #ex. values: ns1:name=percona,ns2:run=nginx 
+  auxiliaryAppInfo: ''
+  appinfo:
+    appns: 'default'
+    applabel: 'app=nginx'
+    appkind: 'deployment'
+  chaosServiceAccount: node-memory-hog-sa
+  monitoring: false
+  # It can be delete/retain
+  jobCleanUpPolicy: 'delete'
+  experiments:
+    - name: node-memory-hog
+      spec:
+        components:
+          env:
+            # set chaos duration (in sec) as desired
+            - name: TOTAL_CHAOS_DURATION
+              value: '60'
+            ## specify the size as percent of total available memory (in percentage %)
+            ## default value 90%
+            - name: MEMORY_PERCENTAGE
+              value: '90'             
+            # set chaos platform as desired
+            - name: PLATFORM
+              value: 'GKE'
+            # chaos lib used to inject the chaos
+            - name: LIB
+              value: 'litmus'

charts/generic/node-memory-hog/experiment.yaml

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+apiVersion: litmuschaos.io/v1alpha1
+description:
+  message: |
+    Give a memory hog on a node belonging to a deployment
+kind: ChaosExperiment
+metadata:
+  name: node-memory-hog
+  version: 0.1.0
+spec:
+  definition:
+    scope: Cluster
+    permissions:
+      - apiGroups:
+          - ""
+          - "batch"
+          - "apps"
+          - "litmuschaos.io"
+        resources:
+          - "jobs"
+          - "pods"
+          - "pods/log"
+          - "events"
+          - "chaosengines"
+          - "chaosexperiments"
+          - "chaosresults"
+        verbs:
+          - "create"
+          - "list"
+          - "get"
+          - "patch"
+          - "update"
+          - "delete"
+      - apiGroups:
+          - ""
+        resources: 
+          - "nodes"
+        verbs :
+          - "get"
+          - "list"
+    image: "litmuschaos/ansible-runner:latest"
+    args:
+    - -c
+    - ansible-playbook ./experiments/generic/node_memory_hog/node_memory_hog_ansible_logic.yml -i /etc/ansible/hosts -vv; exit 0
+    command:
+    - /bin/bash
+    env:
+
+    - name: ANSIBLE_STDOUT_CALLBACK
+      value: 'default'
+
+    - name: TOTAL_CHAOS_DURATION
+      value: '60'
+
+    # Period to wait before injection of chaos in sec
+    - name: RAMP_TIME
+      value: ''
+
+    - name: PLATFORM
+      value: 'GKE'
+
+    - name: LIB
+      value: 'litmus'
+      
+    labels:
+      name: node-memory-hog

charts/generic/node-memory-hog/node-memory-hog.chartserviceversion.yaml

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+apiVersion: litmuchaos.io/v1alpha1
+kind: ChartServiceVersion
+metadata:
+  createdAt: 2020-03-28T10:28:08Z
+  name: node-memory-hog
+  version: 0.1.0
+  annotations:
+    categories: Kubernetes
+    vendor: CNCF
+    support: https://slack.kubernetes.io/
+spec:
+  displayName: node-memory-hog
+  categoryDescription: |
+    Kubernetes Node memory hog contains chaos to disrupt the state of Kubernetes resources. Experiments can inject a memory spike on a node where the application pod is scheduled.
+    - Memory hog on a particular node where the application deployment is available.
+    - After the test, the recovery should be manual for the application pod and node in case they are not in an appropriate state. 
+
+  keywords:
+    - Kubernetes
+    - Memory
+    - State 
+    - Node
+  platforms:
+    - GKE
+  maturity: alpha
+  chaosType: infra
+  maintainers:
+    - name: Udit Gaurav
+      email: udit.gaurav@mayadata.io
+  minKubeVersion: 1.12.0
+  provider:
+    name: Mayadata
+  links:
+    - name: Source Code
+      url: https://github.com/litmuschaos/litmus/tree/master/experiments/generic/node_memory_hog
+    - name: Documentation
+      url: https://docs.litmuschaos.io/docs/node-memory-hog/
+    - name: Video
+      url:
+  icon:
+    - url: ""
+      mediatype: ""
+  chaosexpcrdlink: https://raw.githubusercontent.com/litmuschaos/chaos-charts/master/charts/generic/node-memory-hog/experiment.yaml

charts/generic/node-memory-hog/rbac.yaml

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+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: node-memory-hog-sa
+  namespace: default
+  labels:
+    name: node-memory-hog-sa
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  name: node-memory-hog-sa
+  labels:
+    name: node-memory-hog-sa
+rules:
+- apiGroups: ["","litmuschaos.io","batch","apps"]
+  resources: ["pods","jobs","pods/log","events","chaosengines","chaosexperiments","chaosresults"]
+  verbs: ["create","list","get","patch","update","delete"]
+- apiGroups: [""]
+  resources: ["nodes"]
+  verbs : ["get","list"]
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  name: node-memory-hog-sa
+  labels:
+    name: node-memory-hog-sa
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: node-memory-hog-sa
+subjects:
+- kind: ServiceAccount
+  name: node-memory-hog-sa
+  namespace: default