Release 0.13.0

This tempest-lib release includes:
 * Migrated service clients for Neutron from tempest:
   * floating_ips_client.py
   * metering_label_rules_client.py
   * metering_labels_client.py
   * networks_client.py
   * ports_client.py
   * subnets_client.py
 * Keep py3.X compatibility for urllib
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