Make sure iptables-services is installed

The iptables service files are no longer included by default on
Fedora.  This causes the systemctl calls in fixup_stuff.sh to fail
when disabling firewalld in favor of iptables.

Change-Id: If37691d03e3d07ca8b53c541717081beeb184c16
Closes-Bug: #1462347
diff --git a/files/rpms/general b/files/rpms/general
index 7b2c00a..43101f7 100644
--- a/files/rpms/general
+++ b/files/rpms/general
@@ -28,3 +28,4 @@
 java-1.7.0-openjdk-headless  # NOPRIME rhel7,f20
 java-1.8.0-openjdk-headless  # NOPRIME f21,f22
 pyOpenSSL # version in pip uses too much memory
+iptables-services  # NOPRIME f21,f22