[CentOS] Firewalld zone conflict

Fri Dec 4 14:18:43 UTC 2015
Colin Coles <colin at wemoto.com>

 In CentOS7 I have added two zones using firewall-cmd, each for
different ports/services and interfaces when I try to --add-source to
the second zone with an IP that is already in the first I am getting an
'Error: ZONE_CONFLICT' message. Am I trying to do something illogical or
is this a feature?