Fix more goimports
```
daemon/logger/splunk/splunk_test.go:33: File is not `goimports`-ed (goimports)
envKey: "a",
envRegexKey: "^foo",
labelsKey: "b",
tagKey: "c",
integration/build/build_test.go:41: File is not `goimports`-ed (goimports)
rm: false,
forceRm: false,
integration/image/remove_unix_test.go:49: File is not `goimports`-ed (goimports)
Root: d.Root,
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>