Make helm charts and scripts compatible to deploy FfDL on any namespace

[Tomcli]

The PR modifies helm charts and scripts to allow users to deploy FfDL on any namespace.

Closes #55

Note: This PR does not change any FfDL-core code. Therefore, we don't have to rebuild the images.

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[fplk]

Afaict, this PR currently only works for quick deployment and not for a full make deploy. I think in the Makefile line 279 and 281 something like namespace=${Namespace}, has to be added, but even with that change I still get ImagePullBackOffs, i.e.

  Normal   Scheduled              8m                default-scheduler     Successfully assigned ffdl-ui-56959898c8-glj9g to kube-node-2
  Normal   SuccessfulMountVolume  8m                kubelet, kube-node-2  MountVolume.SetUp succeeded for volume "default-token-mlg4l"
  Normal   Pulling                7m (x4 over 8m)   kubelet, kube-node-2  pulling image "morpheus.sl.cloud9.ibm.com/special/ffdl-ui:user-ffdlr"
  Warning  Failed                 7m (x4 over 8m)   kubelet, kube-node-2  Failed to pull image "morpheus.sl.cloud9.ibm.com/special/ffdl-ui:user-ffdlr": rpc error: code = Unknown desc = Error: image special/ffdl-ui:user-ffdlr not found
  Warning  Failed                 7m (x4 over 8m)   kubelet, kube-node-2  Error: ErrImagePull
  Warning  Failed                 6m (x6 over 8m)   kubelet, kube-node-2  Error: ImagePullBackOff
  Normal   BackOff                3m (x19 over 8m)  kubelet, kube-node-2  Back-off pulling image "morpheus.sl.cloud9.ibm.com/special/ffdl-ui:user-ffdlr"

I'm not enitrely sure why that is, since https://github.com/IBM/FfDL/blob/master/templates/services/web-ui.yml seems to refer to the correct image and only uses the namespace without the docker repository URL for the deployment and service.
It should get translated into

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: ffdl-ui
  namespace: special
  labels:
    service: ffdl-ui
spec:
  selector:
    matchLabels:
      service: ffdl-ui
  replicas: 1
  template:
    metadata:
      labels:
        service: ffdl-ui
        version: user-ffdlr
    spec:
      containers:
      - name: ffdl-ui-container
        image: morpheus.sl.cloud9.ibm.com/special/ffdl-ui:user-ffdlr

        imagePullPolicy: Always

        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: 50m
            memory: 64Mi
      imagePullSecrets:
      - name: regcred

I assume since you did the PR you have a higher chance of knowing why that is. If not, let me know and we can look into it together.

[fplk]

So we just need to create a secret in the namespace as well via kubectl create secret docker-registry regcred --docker-server=${DOCKER_REPO} --docker-username=${DOCKER_REPO_USER} --docker-password=${DOCKER_REPO_PASS} --docker-email=unknown@docker.io -n ${NAMESPACE} - needs to be added to documentation. You might also want to capitalize Namespace. Everything else seems perfect. Great job.