Adding GetConfig operation for Rackspace provider
diff --git a/rackspace/db/v1/instances/requests.go b/rackspace/db/v1/instances/requests.go
new file mode 100644
index 0000000..a0ffcad
--- /dev/null
+++ b/rackspace/db/v1/instances/requests.go
@@ -0,0 +1,21 @@
+package instances
+
+import (
+	"github.com/racker/perigee"
+	"github.com/rackspace/gophercloud"
+)
+
+func GetDefaultConfig(client *gophercloud.ServiceClient, id string) ConfigResult {
+	var res ConfigResult
+
+	resp, err := perigee.Request("GET", configURL(client, id), perigee.Options{
+		MoreHeaders: client.AuthenticatedHeaders(),
+		Results:     &res.Body,
+		OkCodes:     []int{200},
+	})
+
+	res.Header = resp.HttpResponse.Header
+	res.Err = err
+
+	return res
+}