Don't return POST_FAILURE when aborting post playbooks

Change-Id: I879eada078df7cfdce633318e4034cd0f788fb1b
diff --git a/tests/fixtures/config/post-playbook/main.yaml b/tests/fixtures/config/post-playbook/main.yaml
new file mode 100644
index 0000000..6033879
--- /dev/null
+++ b/tests/fixtures/config/post-playbook/main.yaml
@@ -0,0 +1,9 @@
+- tenant:
+    name: tenant-one
+    source:
+      gerrit:
+        config-projects:
+          - common-config
+        untrusted-projects:
+          - org/project
+