Make openSUSE port up-to-date

Several changes didn't properly deal with openSUSE, so fix this.

Change-Id: Icc9c894031a8a693d9c41e2ec5717bd76f618342
diff --git a/files/rpms-suse/ryu b/files/rpms-suse/ryu
index 763fd24..90b43a4 100644
--- a/files/rpms-suse/ryu
+++ b/files/rpms-suse/ryu
@@ -2,4 +2,5 @@
 python-setuptools # instead of python-distribute; dist:sle11sp2
 python-Sphinx
 python-gevent
+python-netifaces
 python-python-gflags