Clean up bad layout files in zuul tests

Clean up the bad layout files in the zuul tests by removing a redundant
file (bad_pipeline and bad_pipeline1.yaml were identical). Annotate the
reason the layout is bad in each file. Finally remove a redundant swift
section. Both bad switf sections were failing for the same reason, a
missing name entry.

Change-Id: I0fd09da1fb0ec7443fa7d12a3b31809546a01afd
diff --git a/tests/fixtures/layouts/bad_pipelines3.yaml b/tests/fixtures/layouts/bad_pipelines3.yaml
index 0c11a85..93ac266 100644
--- a/tests/fixtures/layouts/bad_pipelines3.yaml
+++ b/tests/fixtures/layouts/bad_pipelines3.yaml
@@ -1,5 +1,7 @@
 pipelines:
   - name: check
+    # The manager must be one of IndependentPipelineManager
+    # or DependentPipelineManager
     manager: NonexistentPipelineManager
 
 projects: