hosts: Move koji0.p.b to offline

I doubt I will be using Koji much if at all any more.  In preparation
for decommissioning it, I am moving the Koji inventory to hosts.offline,
to prevent Jenkins jobs from failing.

hosts.offline

@@ -4,7 +4,21 @@ ansible_python_interpreter=/usr/bin/python3
 [dhcpcd:children]
 vm-hosts
 
+[koji:children]
+koji-builder
+koji-hub
+
+[koji-builder]
+koji0.pyrocufflink.blue
+
+[koji-hub]
+koji0.pyrocufflink.blue
+
+[koji-web]
+koji0.pyrocufflink.blue
+
 [pyrocufflink]
+koji0.pyrocufflink.blue
 taiga0.pyrocufflink.blue
 vmhost0.pyrocufflink.blue
 vmhost1.pyrocufflink.blue