Since TW 20180312 firewalld produces a conflict with SuSEfirewall2.

But the also offered conversion script, susefirewall2-to-firewalld, requires
both installed:

lux:~% zypper info --requires susefirewall2-to-firewalld

Information for package susefirewall2-to-firewalld:
---------------------------------------------------
Repository     : openSUSE-Tumbleweed                              
Name           : susefirewall2-to-firewalld                       
Version        : 0.0.1-1.5                                        
Arch           : noarch                                           
Vendor         : openSUSE                                         
Installed Size : 83.8 KiB                                         
Installed      : No                                               
Status         : not installed                                    
Source package : susefirewall2-to-firewalld-0.0.1-1.5.src         
Summary        : Basic SuSEfirewall2 to FirewallD migration script
Description    :                                                  
    This is a simple bash script aiming to provide a basic migration path from
    SuSEfirewall2 to FirewallD.
Requires       : [7]                                              
    /bin/bash
    iptables
    firewalld
    SuSEfirewall2
    rpmlib(CompressedFileNames) <= 3.0.4-1
    rpmlib(PayloadFilesHavePrefix) <= 4.0-1
    rpmlib(PayloadIsXz) <= 5.2-1