[19.03 backport] vendor buildkit to f238f1e, bump google.golang.org/grpc v1.20.1 #1884
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backport of;
full diff: grpc/grpc-go@v1.12.2...v1.20.1
includes grpc/grpc-go#2695 transport: do not close channel that can lead to panic
fixes moby/moby#39053