firewalld trusted zone does not contain target="ACCEPT" on a clean install

[Alex Chistyakov]

root@bi02:~# lsb_release -rd
Description: Ubuntu 16.04.4 LTS
Release: 16.04
root@bi02:~# apt-cache policy firewalld
firewalld:
  Installed: 0.4.0-1ubuntu0.1
  Candidate: 0.4.0-1ubuntu0.1
  Version table:
 *** 0.4.0-1ubuntu0.1 500
        500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
        500 http://ru.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/universe i386 Packages
        100 /var/lib/dpkg/status
     0.4.0-1 500
        500 http://ru.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        500 http://ru.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
root@bi02:~#

Expected:

root@bi02:~# cat /etc/firewalld/zones/trusted.xml
<?xml version="1.0" encoding="utf-8"?>
<zone target="ACCEPT">
  <short>Trusted</short>
  <description>All network connections are accepted.</description>
</zone>

Got:

root@bi02:~# cat /etc/firewalld/zones/trusted.xml
<?xml version="1.0" encoding="utf-8"?>
<zone>
  <interface name="aggi"/>
</zone>