Feature/filestorage sharenetworks get (#125)

* sfs: Add get for share networks

* sfs: Add acceptance test for share network Get

* sfs: Improve unit test for share network Get
diff --git a/openstack/sharedfilesystems/v2/sharenetworks/urls.go b/openstack/sharedfilesystems/v2/sharenetworks/urls.go
index 464c17a..9e2c8e9 100644
--- a/openstack/sharedfilesystems/v2/sharenetworks/urls.go
+++ b/openstack/sharedfilesystems/v2/sharenetworks/urls.go
@@ -13,3 +13,7 @@
 func listDetailURL(c *gophercloud.ServiceClient) string {
 	return c.ServiceURL("share-networks", "detail")
 }
+
+func getURL(c *gophercloud.ServiceClient, id string) string {
+	return deleteURL(c, id)
+}