cmd/dist: change fetch to fetch-object command

To allow us to differentiate from fetching an image, fetch a part of an
image and pulling an image, we now call the `fetch` command the
`fetch-object` command. We can now introduce a command that does the
complete image fetch without creating snapshots, allowing `pull` to
perform the entire process.

Signed-off-by: Stephen J Day <stephen.day@docker.com>

cmd/dist/delete.go

@@ -14,7 +14,7 @@ import (
 
 var deleteCommand = cli.Command{
 	Name:      "delete",
-	Aliases:   []string{"delete", "del", "remove", "rm"},
+	Aliases:   []string{"del", "remove", "rm"},
 	Usage:     "permanently delete one or more blobs.",
 	ArgsUsage: "[flags] [<digest>, ...]",
 	Description: `Delete one or more blobs permanently. Successfully deleted