Adding BlockStorage v3 version support

Change-Id: Ia0c304731f2f1f35d80a9168cd9bb2ca3a8a08b9
diff --git a/openstack/blockstorage/v3/snapshots/urls.go b/openstack/blockstorage/v3/snapshots/urls.go
new file mode 100644
index 0000000..01237ef
--- /dev/null
+++ b/openstack/blockstorage/v3/snapshots/urls.go
@@ -0,0 +1,7 @@
+package snapshots
+
+import gophercloud "gerrit.mcp.mirantis.net/debian/gophercloud.git"
+
+func listURL(c *gophercloud.ServiceClient) string {
+	return c.ServiceURL("snapshots")
+}