Undercloud Installation fails with missing default route.

Issue

During the undercloud deployment network connectivity is lost because the default route is lost:

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.100.0   0.0.0.0         255.255.255.0 U     0      0        0 br-ctlplane

Additionally these logs can be seen in the logs located in /home/stack/.instack/install-undercloud.log

2017-02-10 09:43:30,828 INFO: 2017-02-10 09:43:30 - Warning: You cannot collect exported resources without storeconfigs being set; the collection will be ignored on line 100 in file /etc/puppet/modules/mistral/manifests/api.pp
2017-02-10 09:43:33,038 INFO: 2017-02-10 09:43:33 - Warning: Scope(Neutron::Plugins::Ml2::Type_driver[local]): local type_driver is useful only for single-box, because it provides no connectivity between hosts
2017-02-10 09:43:36,780 INFO: 2017-02-10 09:43:36 - Notice: Compiled catalog for in environment production in 13.09 seconds
2017-02-10 09:43:49,817 INFO: 2017-02-10 09:43:49 - Notice: /Stage[setup]/Vswitch::Ovs/Package[openvswitch]/ensure: created
2017-02-10 09:43:50,088 INFO: 2017-02-10 09:43:50 - Notice: /Stage[setup]/Vswitch::Ovs/Service[openvswitch]/ensure: ensure changed 'stopped' to 'running'
2017-02-10 09:43:50,088 INFO: 2017-02-10 09:43:50 - Notice: /Stage[setup]/Firewall::Linux::Redhat/File[/etc/sysconfig/iptables]/ensure: created
2017-02-10 09:43:56,506 INFO: 2017-02-10 09:43:56 - Notice: /Stage[setup]/Tripleo::Network::Os_net_config/Exec[os-net-config]/returns: executed successfully
2017-02-10 09:43:56,512 INFO: 2017-02-10 09:43:56 - Notice: /Stage[setup]/Tripleo::Network::Os_net_config/Exec[trigger-keepalived-restart]: Triggered 'refresh' from 1 events
2017-02-10 09:43:59,809 INFO: 2017-02-10 09:43:59 - Error: Execution of '/bin/yum -d 0 -e 0 -y install iptables-services' returned 1: Error downloading packages:
2017-02-10 09:43:59,809 INFO: 2017-02-10 09:43:59 -   iptables-services-1.4.21-17.el7.x86_64: [Errno 256] No more mirrors to try.
2017-02-10 09:43:59,811 INFO: 2017-02-10 09:43:59 - Error: /Stage[setup]/Firewall::Linux::Redhat/Package[iptables-services]/ensure: change from absent to present failed: Execution of '/bin/yum -d 0 -e 0 -y install iptables-services' returned 1: Error downloading packages:
2017-02-10 09:43:59,811 INFO: 2017-02-10 09:43:59 -   iptables-services-1.4.21-17.el7.x86_64: [Errno 256] No more mirrors to try.