grpc: go generate (#2712)

*grpc* was added manually; do a go generate to add it, so we don't have
future diffs.
Signed-off-by: Miek Gieben <miek@miek.nl>

core/dnsserver/zdirectives.go

@@ -44,8 +44,8 @@ var Directives = []string{
 	"loop",
 	"forward",
 	"proxy",
+	"grpc",
 	"erratic",
 	"whoami",
 	"on",
-	"grpc",
 }

go.sum

@@ -2,6 +2,7 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 cloud.google.com/go v0.28.0 h1:KZ/88LWSw8NxMkjdQyX7LQSGR9PkHr4PaVuNm8zgFq0=
 cloud.google.com/go v0.28.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/DataDog/zstd v1.3.5 h1:DtpNbljikUepEPD16hD4LvIcmhnhdLTiW/5pHgbmp14=
 github.com/DataDog/zstd v1.3.5/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
 github.com/Shopify/sarama v1.21.0 h1:0GKs+e8mn1RRUzfg9oUXv3v7ZieQLmOZF/bfnmmGhM8=
 github.com/Shopify/sarama v1.21.0/go.mod h1:yuqtN/pe8cXRWG5zPaO7hCfNJp5MwmkoJEoLjkm5tCQ=