Remove unused tripleo::network::os_net_config
Remove unused tripleo::network::os_net_config

This class was used to run os-net-config in undercloud node, but since
we containerized undercloud we use ansible instead of puppet to run
the command.

Change-Id: Id8036e9eed8c2f1ba6df37dd58f85e03fcfb6c30

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo