Automatic merge from submit-queue

Enable streaming proxy redirects by default (beta)

Prerequisite to moving CRI to Beta.

I'd like to enable this early in our 1.6 cycle to get plenty of test coverage before release.

@yujuhong @liggitt 

```release-note
Follow redirects for streaming requests (exec/attach/port-forward) in the apiserver by default (alpha -> beta).
```