Allow Koschei backend to emit new fedmsg topic

Upstream links:
- issue: https://github.com/msimacek/koschei/issues/17
- pull request: https://github.com/msimacek/koschei/pull/136

inventory/group_vars/koschei-backend

@@ -42,6 +42,7 @@ fedmsg_certs:
   owner: root
   group: koschei
   can_send:
+  - koschei.collection.state.change
   - koschei.package.state.change
   - koschei.update
 

inventory/group_vars/koschei-backend-stg

@@ -40,6 +40,7 @@ fedmsg_certs:
   owner: root
   group: koschei
   can_send:
+  - koschei.collection.state.change
   - koschei.package.state.change
   - koschei.update