Remove unnecesary imports of exampleServiceFile() (#3558)

in codegen/service.

Co-authored-by: Raphael Simon <[email protected]>

Author: tchssk

codegen/service/example_svc.go

@@ -68,7 +68,6 @@ func exampleServiceFile(genpkg string, _ *expr.RootExpr, svc *expr.ServiceExpr,
 	specs := []*codegen.ImportSpec{
 		{Path: "io"},
 		{Path: "context"},
-		{Path: "log"},
 		{Path: "fmt"},
 		{Path: "strings"},
 		{Path: path.Join(genpkg, svcName), Name: data.PkgName},