Quantum/plugins/ryu: minor update for Quantum Ryu plugin

- updated package list for Ryu
  ryu plugin/agent needs python-netifaces
- quantum-ryu-agent also needs ryu module

Change-Id: I5b49efceb65e8139a49a8e82f55ea6aa7d1eebac
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
diff --git a/lib/quantum_plugins/ryu b/lib/quantum_plugins/ryu
index 86105bc..3f960ea 100644
--- a/lib/quantum_plugins/ryu
+++ b/lib/quantum_plugins/ryu
@@ -15,6 +15,9 @@
 
 function quantum_plugin_install_agent_packages() {
     _quantum_ovs_base_install_agent_packages
+
+    # quantum_ryu_agent requires ryu module
+    install_ryu
 }
 
 function quantum_plugin_configure_common() {