Fixes packstack failure when interface has no assigned ip address

In case we have unconfigured interfaces cidr_to_ifname() searches
its ipaddress and network mask and throws an exception.

Change-Id: I829a874ca44c2e4176bb1eeba28c3f49c44c72ca
Closes-bug: #1638549

packstack/modules/common.py

@@ -77,12 +77,13 @@ def cidr_to_ifname(cidr, host, config):
 
             for interface in info['interfaces'].split(','):
                 interface = interface.strip()
-                ipaddr = info['ipaddress_{}'.format(interface)]
-                netmask = info['netmask_{}'.format(interface)]
-                subnet_b = netaddr.IPNetwork('{ipaddr}/{netmask}'.format(**locals()))
-                if subnet_a == subnet_b:
-                    translated.append(interface)
-                    break
+                ipaddr = info.get('ipaddress_{}'.format(interface))
+                netmask = info.get('netmask_{}'.format(interface))
+                if ipaddr and netmask:
+                    subnet_b = netaddr.IPNetwork('{ipaddr}/{netmask}'.format(**locals()))
+                    if subnet_a == subnet_b:
+                        translated.append(interface)
+                        break
         result.append(':'.join(translated))
     return ','.join(result)
 

packstack/puppet/modules/packstack/lib/puppet/parser/functions/force_interface.rb

@@ -30,6 +30,9 @@ module Puppet::Parser::Functions
             lookupvar('interfaces').split(',').each do |interface|
               interface.strip!
               ifaddr = lookupvar("ipaddress_#{interface}")
+              if ifaddr == nil
+                next
+              end
               ifcidr = IPAddr.new ifaddr
               if cidr.include?(ifcidr)
                 translated.push(interface)