Commits on Apr 3, 2019

1. source: make the Informer source compatible with cache.Informer …

   Before fc804a4 (kubernetes-sigs#267), the `cache.Informers` interface methods returned
   `k8s.io/client-go/tools/cache.SharedIndexInformer`s which were by default
   compatible with the built-in `source.Informer`. Users could create arbitrary
   `cache.Cache` instances (or get them from the `Manager`) and then use
   `controller.Watch` to drive a controller with a `source.Informer` from the
   `cache.Cache`.
   
   With fc804a4, the `cache.Informers` interface was changed to return
   `cache.Informer` instances; however, `source.Informer` was not updated to accept
   a `cache.Informer`, and so users can no longer use the built-in
   `source.Informer` with `cache.Cache`.
   
   The `cache.Informer` interface appears to satisfy the needs of
   `source.Informer`. This commit broadens `source.Informer` to accept a
   `cache.Informer`, restoring the prior capability while remaining compatible
   with `SharedIndexInformer` use.

   

   ironcladlou committed Apr 3, 2019
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