Run zuul-stream-functional on every change to ansible

Everytime we change something in ansible we potentially break log
streaming so run zuul-stream-functional for any change in ansible.

Also run it for requirements.txt as updated ansible versions also
likely break log streaming.

Change-Id: I717840ca109cfb0af21b35fc0b0a4a9ba95727a9
diff --git a/.zuul.yaml b/.zuul.yaml
index d73be8f..caef296 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -25,8 +25,9 @@
     required-projects:
       - openstack/ara
     files:
-      - zuul/ansible/callback/.*
+      - zuul/ansible/.*
       - playbooks/zuul-stream/.*
+      - requirements.txt
 
 - project:
     check: