Validate zuul_stream func test output

If we have to visually inspect the output of this test on every
run, we will fail, because we will certainly not visually inspect
the output of this test on every run. Let's at least try to
automate some of the validation.

Change-Id: Ib3b060c60d6037f664636b8854aa488573826a06
diff --git a/playbooks/zuul-stream/fixtures/test-stream-failure.yaml b/playbooks/zuul-stream/fixtures/test-stream-failure.yaml
index 272431a..3e7b27a 100644
--- a/playbooks/zuul-stream/fixtures/test-stream-failure.yaml
+++ b/playbooks/zuul-stream/fixtures/test-stream-failure.yaml
@@ -7,9 +7,9 @@
       - name: Run a shell task with an ansible python exception
         command: echo foo
         args:
-          chdir: /somewhere/that/does/not/exist
+          chdir: /failure-shelltask/somewhere/that/does/not/exist
 
-    - always:
+      always:
 
       - name: Loop with items on an ansible python exception
         command: "echo {{ item }}"
@@ -18,4 +18,4 @@
           - item2
           - item3
         args:
-          chdir: /somewhere/that/does/not/exist
+          chdir: /failure-itemloop/somewhere/that/does/not/exist