vp9: 1 pass vbr: More even spacing for gf near key frame.
More even spacing near key frame and avoid gf on scene cut if its close to key frame. Small increase in metrics for ytlive set (which uses key-period=150). (~0.2% gain) Change only affects 1 pass vbr mode. Change-Id: If1e5a59baf1e0befbaf998522fbc47d94ac5b5df
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