cli/command/container: suppress dogsled warnings
```
cli/command/container/opts_test.go:68:2: declaration has 3 blank identifiers (dogsled)
_, _, _, err := parseRun(strings.Split(args+" ubuntu bash", " "))
^
cli/command/container/opts_test.go:542:2: declaration has 3 blank identifiers (dogsled)
_, _, _, err = parseRun([]string{"--uts=container:", "img", "cmd"})
^
cli/command/container/opts_test.go:603:2: declaration has 3 blank identifiers (dogsled)
_, _, _, err := parseRun([]string{"--rm", "--restart=always", "img", "cmd"})
^
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
79dc83e78b