Add a test to verify basic console output

This also fixes a condition in zuul_stream which would cause us
not to see stdout from tasks run on the executor (localhost).

Change-Id: I24df40adaf06a7bf0b238be33b8ab29cb692f836
diff --git a/tests/fixtures/config/job-output/main.yaml b/tests/fixtures/config/job-output/main.yaml
new file mode 100644
index 0000000..208e274
--- /dev/null
+++ b/tests/fixtures/config/job-output/main.yaml
@@ -0,0 +1,8 @@
+- tenant:
+    name: tenant-one
+    source:
+      gerrit:
+        config-projects:
+          - common-config
+        untrusted-projects:
+          - org/project