Fix flaky v4l2 stream proxy e2e test - #3088
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The fake video producer in the v4l2_stream_proxy e2e test sometimes fails with a "broken pipe" error, which causes other tests to fail. However, broken pipes are expected when stopping streamming in the guest, so we need to place the video producer login in a loop so it retries instead of erroring. Also ensures the fifo is mounted into the container when the test is ran with podcvd. Bug: 548638693
This reverts commit b63bde5.
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The fake video producer in the v4l2_stream_proxy e2e test sometimes
fails with a "broken pipe" error, which causes other tests to fail.
However, broken pipes are expected when stopping streamming in the
guest, so we need to place the video producer login in a loop so it
retries instead of erroring.
Bug: 548638693