pkg/cache's reader methods should block until caches are sync'd about controller-runtime

[calind]

Is there a way to wait for the client to sync it's caches? I'm experiencing data races in tests where the manager and the client.Get try to sync the caches.

[DirectXMan12]

we should already be doing that for the cache, but yeah, there's a function to wait for the caches to sync on the Cache interface called WaitForCacheSync.

[nvachhar]

I just filed #370. I'm not sure if this is the same thing that this issue is mentioning.

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[DirectXMan12]

I believe this is fixed now, as per #370.