This is done by split the interface pillar value instead of using a proper
list so it behaves exactly the same as before for simple 1 interface cases
(no need to refactor one's pillar files).
The resulting is something like:
Listen 1.2.3.4:80
Listen [2001🔤def💯:3]:80
<VirtualHost 1.2.3.4:80 [2001🔤def💯:3]:80>
...
