cmd/go: add -test to go list usage line

Change-Id: Ia57f0ef1a3bdeb06346e175d67979e2a4512622d
Reviewed-on: https://go-review.googlesource.com/112160
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/go/alldocs.go

@@ -579,7 +579,7 @@
 //
 // Usage:
 //
-// 	go list [-deps] [-e] [-f format] [-json] [build flags] [packages]
+// 	go list [-deps] [-e] [-f format] [-json] [-test] [build flags] [packages]
 //
 // List lists the packages named by the import paths, one per line.
 //

src/cmd/go/internal/list/list.go

@@ -23,7 +23,7 @@ import (
 )
 
 var CmdList = &base.Command{
-	UsageLine: "list [-deps] [-e] [-f format] [-json] [build flags] [packages]",
+	UsageLine: "list [-deps] [-e] [-f format] [-json] [-test] [build flags] [packages]",
 	Short:     "list packages",
 	Long: `
 List lists the packages named by the import paths, one per line.