Description of problem:
After changing a cluster firewall type to firewalld and reinstalling a host to apply the change, the network interfaces are not in the "public" firewalld zone until the host is rebooted.

One problem detected because of this is that the playbook to re-deploy hosted-engine fails in the task "Get active list of active firewalld zones".

I'm not sure if this have other functional or security related implications.

Version-Release number of selected component (if applicable):
ovirt-engine-4.3.9.4-11.el7.noarch

How reproducible:
Always

Steps to Reproduce:
1. Have RHV 4.2 cluster with firewall type 'iptables'.
2. Upgrade it to RHV 4.3, raise CL to 4.3
3. Change firewall type to 'firewalld'
4. Put one host into maintenance
5. Host -> Installation -> Reinstall. "Automatically configure host firewall" checked.

Actual results:
After the host reinstallation, firewalld is configured, but the interfaces are not assigned to the public zone.

# firewall-cmd --get-active-zones

# firewall-cmd --list-all
public
  target: default
  icmp-block-inversion: no
  interfaces: 
  sources: 
  services: ssh dhcpv6-client cockpit vdsm libvirt glusterfs libvirt-tls snmp ovirt-imageio ovirt-vmconsole
  ports: 16514/tcp 22/tcp 6081/udp
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules: 


After rebooting the host, the interfaces are correctly assigned:

# firewall-cmd --get-active-zones
public
  interfaces: ovirtmgmt eth0

# firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: ovirtmgmt eth0
  sources: 
  services: ssh dhcpv6-client cockpit vdsm libvirt glusterfs libvirt-tls snmp ovirt-imageio ovirt-vmconsole
  ports: 16514/tcp 22/tcp 6081/udp
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules:

Expected results:
The interfaces added to the zone in the runtime configuration.

Additional info: