Add namespaces argument for chao

[ZachNo]

The chao agent can accept an argument to limit the targeting of namespaces watched and uploaded. This change exposes that argument more easily in the helm chart.

helm template gremlin ./gremlin --namespace gremlin --set gremlin.hostPID=true --set gremlin.hostNetwork=true --set gremlin.collect.processes=true --set gremlin.container.driver=docker-runc --set gremlin.secret.managed=true --set gremlin.secret.type=secret --set gremlin.secret.teamID=a --set gremlin.secret.teamSecret=b --set gremlin.serviceUrl=c --set image.tag=$(git rev-parse HEAD) --debug --set chao.namespaces[0]=x --set chao.namespaces[1]=y --set chao.namespaces[2]=z
......
# Source: gremlin/templates/chao-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app.kubernetes.io/instance: chao
    app.kubernetes.io/name: chao
    helm.sh/chart: gremlin-0.18.0
    app.kubernetes.io/version: "1"
  name: chao
  namespace: gremlin
spec:
  replicas: 1
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  selector:
    matchLabels:
      app.kubernetes.io/instance: chao
      app.kubernetes.io/name: chao
      app.kubernetes.io/version: "1"
  template:
    metadata:
      labels:
        app.kubernetes.io/instance: chao
        app.kubernetes.io/name: chao
        helm.sh/chart: gremlin-0.18.0
        app.kubernetes.io/version: "1"
    spec:
      serviceAccountName: chao
      containers:
        - image: gremlin/chao:latest
          env:
            - name: GREMLIN_TEAM_ID
              valueFrom:
                secretKeyRef:
                  name:  gremlin-secret
                  key: GREMLIN_TEAM_ID
            - name: GREMLIN_CLUSTER_ID
              valueFrom:
                secretKeyRef:
                  name:  gremlin-secret
                  key: GREMLIN_CLUSTER_ID
            - name: GREMLIN_TEAM_SECRET
              valueFrom:
                secretKeyRef:
                  name: gremlin-secret
                  key: GREMLIN_TEAM_SECRET
          args:
            - "-api_url"
            - "c/kubernetes"
            - "-namespaces"
            - "x,y,z"
          imagePullPolicy: Always
          name: chao
      volumes:
      - name: gremlin-cert
        secret:
          secretName: gremlin-secret