Remove worthless iptables test

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

integration/iptables_test.go

@@ -1,22 +0,0 @@
-package docker
-
-import (
-	"github.com/dotcloud/docker/pkg/iptables"
-	"os"
-	"testing"
-)
-
-// FIXME: this test should be a unit test.
-// For example by mocking os/exec to make sure iptables is not actually called.
-
-func TestIptables(t *testing.T) {
-	if _, err := iptables.Raw("-L"); err != nil {
-		t.Fatal(err)
-	}
-	path := os.Getenv("PATH")
-	os.Setenv("PATH", "")
-	defer os.Setenv("PATH", path)
-	if _, err := iptables.Raw("-L"); err == nil {
-		t.Fatal("Not finding iptables in the PATH should cause an error")
-	}
-}