http2: fix racey and flaky server push test

The bad test was added in https://go-review.googlesource.com/32887.
My fault.

Change-Id: Iee98ef0579bc5de086fa286530d45db009407d10
Reviewed-on: https://go-review.googlesource.com/32910
Reviewed-by: Brad Fitzpatrick <[email protected]>
Run-TryBot: Brad Fitzpatrick <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
1 file changed
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