Add option to pull images quietly

Add `--quiet` to the `docker image pull` subcommand that will not pull
the image quietly.

```
$ docker pull -q golang
Using default tag: latest
```

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

docs/reference/commandline/pull.md

@@ -24,6 +24,7 @@ Options:
   -a, --all-tags                Download all tagged images in the repository
       --disable-content-trust   Skip image verification (default true)
       --help                    Print usage
+  -q, --quiet                   Suppress verbose output
 ```
 
 ## Description