Add install template for sidecar initializer

[gyliu513]

We introduced sidecar initializer at istio/old_pilot_repo#335 , should enable it as a deployment here.

/cc @ayj comments?

[ayj]

Yes, that's the plan. It needs to be done in two steps: (1) enable initializer deployment (w/ConfigMap) and (2) enable InitializerConfiguration. (1) needs to be running in all test instances across the shared clusters before (2) to avoid namespaces without a corresponding initializer.

[gyliu513]

@ayj for this issue, I think that I only need to add (1) a new deployment file for initializer and (2) a InitializerConfiguration , which test shall I run in istio?

[ayj]

https://github.com/istio/istio/blob/master/tests/e2e.sh

Don't enable the InitializerConfiguration by default in the changes pushed to Github just yet. Its fine to test locally but we need to phase-in this feature to avoid breaking tests in the shared cluster.

[andraxylia]

This is done.