Support deploying multiple instances to the same cluster

[antdking]

Is your feature request related to a problem? Please describe.

We deploy multiple instances of Fission; however parts of the Chart don't support this pattern out the box.
The main problem is with the Webhook configurations, which aren't namespaced + use static names while being cluster-scoped objects.
This causes conflicts while deploying, and problems with multiple instances trying to handle the same request.

Describe the solution you'd like

Apply namespace scoping + unique names to the Webhook Configuration objects.
We have a patch prepared for our usecase as an example, and are happy to open a PR in the near future.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[thoma01]

@antdking This patch is working for me as well! Do you think you could open a PR and we can work to get this merged into the next release?