Kernel prepatch 4.9-rc8

The 4.9-rc8 kernel prepatch is out; thefinal 4.9 release will need one more week. "So if anybody has beenfollowing the git tree, it should come as no surprise that I ended up doingan rc8 after all: things haven't been bad, but it also hasn't been thecomplete quiet that would have made me go 'no point in doing anotherweek'."