Release 0.12.0

This tempest-lib release includes:
 * Migrated service clients for Nova from tempest:
   * volumes_client
   * floating_ips_client
   * interfaces_client
   * server_groups_client
   * security_group_rules_client
   * servers_client
 * python3: converts binary data from channel
 * Add 410 error code handling to REST client
 * Allow passing --insecure to python client binaries
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