Refer feedback from #673 and augment documentation

[martindekov]

Refering feedback from the review #673 which adds multiple
namespaces functionality which includes the following:

• Extend operator readme to mention how to enable the feature
• Remove mentioning that the operator does not support the feature
• Replacing TODO context with the context from the request
• Deferring the closing of the body of the namespaces handler
• Merging the cluster role configuration so it is used in faas-netes
• Reusing the logic of namespaces and secrets handling present in
  faas-netes in the operator. Removing the custom implementations
  as they are no longer used

Signed-off-by: Martin Dekov [email protected]

Description

Motivation and Context

• I have raised an issue to propose this change (required)
  Feedback from Add multiple namespaces in the operator #673

How Has This Been Tested?

Installed local chart for faas-netes and operator and built custom image with the changes stored and pushed in martindekov/faas-netes:asd-3:

helm upgrade --install openfaas ./openfaas --namespace openfaas --values ./openfaas/values.yaml --set operator.create=<true/false> --set openfaasImagePullPolicy=Always --set operator.image=martindekov/faas-netes:asd-3 --set clusterRole=true --set gateway.directFunctions=true --set faasnetes.imagePullPolicy=Always --set basic_auth=false

Tested the operator to check whether the logic for namespaces and secrets is reused properly. Also deployed a function and invoked it in default and custom namespace both in the operator and faas-netes. Also tested whether faas-netes works with the cluster role as expected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Feedback from review Add multiple namespaces in the operator #673

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s
• I have added tests to cover my changes.
• All new and existing tests passed.

[alexellis]

Approved