(enhancement)charts: add standard kubernetes labels to experiments (#346)

Signed-off-by: ksatchit <karthik.s@mayadata.io>

charts/generic/container-kill/rbac.yaml

@@ -6,6 +6,7 @@ metadata:
   namespace: default
   labels:
     name: container-kill-sa
+    app.kubernetes.io/part-of: litmus
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: Role
@@ -14,6 +15,7 @@ metadata:
   namespace: default
   labels:
     name: container-kill-sa
+    app.kubernetes.io/part-of: litmus
 rules:
 - apiGroups: ["","litmuschaos.io","batch","apps"]
   resources: ["pods","jobs","pods/exec","pods/log","events","chaosengines","chaosexperiments","chaosresults"]
@@ -26,6 +28,7 @@ metadata:
   namespace: default
   labels:
     name: container-kill-sa
+    app.kubernetes.io/part-of: litmus
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: Role