Fix double "unix://" scheme in TestInfoAPIWarnings

`d.Sock()` already returns the socket-path including the
`unix://` scheme.

Also removed `--iptables=false`, as it didn't really seem
nescessary for this test.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 14342046477b7ed87a9c5c451bb4520c7f6cabcc)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: c40a7d393bca990e07973024e71034b4b6fc05e5
Component: engine

components/engine/integration/system/info_test.go

@@ -48,7 +48,7 @@ func TestInfoAPIWarnings(t *testing.T) {
 	client, err := d.NewClient()
 	assert.NilError(t, err)
 
-	d.StartWithBusybox(t, "--iptables=false", "-H=0.0.0.0:23756", "-H=unix://"+d.Sock())
+	d.StartWithBusybox(t, "-H=0.0.0.0:23756", "-H="+d.Sock())
 	defer d.Stop(t)
 
 	info, err := client.Info(context.Background())