vp9: Adjust gf period for high average Q and overshoot.
For 1 pass vbr mode. Increase the gf interval for case where average Q is close to max and high overshoot is detected. Small increase in overall avg_psnr/sssim metrics (~0.2/0.1%) for ytlive, but improves the low-end (low bitrate) for several clips (less overshoot). Change-Id: Ifba40f25b4861b2e0d9832c82d5359a6a3dce9f2
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