DNS Zones: List / Get (#271)

* Add Zone List / Get Support

* Addressing code review comments

* Adding v2 to DNS client

* List / Get unit tests plus updates to results for unit tests to work.

* DNS v2 List acceptance tests

* add failing unit test for dns v2 allpages

* Changing acceptance test for DNS v2 to use AllPages

* Adding empty zones.go file for package requirements

* Change ttl back to int

* DNS v2 Zones ListOpts
diff --git a/openstack/dns/v2/zones/testing/requests_test.go b/openstack/dns/v2/zones/testing/requests_test.go
new file mode 100644
index 0000000..b7dd667
--- /dev/null
+++ b/openstack/dns/v2/zones/testing/requests_test.go
@@ -0,0 +1,50 @@
+package testing
+
+import (
+	"testing"
+
+	"github.com/gophercloud/gophercloud/openstack/dns/v2/zones"
+	"github.com/gophercloud/gophercloud/pagination"
+	th "github.com/gophercloud/gophercloud/testhelper"
+	"github.com/gophercloud/gophercloud/testhelper/client"
+)
+
+func TestList(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+	HandleListSuccessfully(t)
+
+	count := 0
+	err := zones.List(client.ServiceClient(), nil).EachPage(func(page pagination.Page) (bool, error) {
+		count++
+		actual, err := zones.ExtractZones(page)
+		th.AssertNoErr(t, err)
+		th.CheckDeepEquals(t, ExpectedZonesSlice, actual)
+
+		return true, nil
+	})
+	th.AssertNoErr(t, err)
+	th.CheckEquals(t, 1, count)
+}
+
+func TestListAllPages(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+	HandleListSuccessfully(t)
+
+	allPages, err := zones.List(client.ServiceClient(), nil).AllPages()
+	th.AssertNoErr(t, err)
+	allZones, err := zones.ExtractZones(allPages)
+	th.AssertNoErr(t, err)
+	th.CheckEquals(t, 2, len(allZones))
+}
+
+func TestGet(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+	HandleGetSuccessfully(t)
+
+	actual, err := zones.Get(client.ServiceClient(), "a86dba58-0043-4cc6-a1bb-69d5e86f3ca3").Extract()
+	th.AssertNoErr(t, err)
+	th.CheckDeepEquals(t, &FirstZone, actual)
+}