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_pipelines4.yaml b/tests/fixtures/layouts/bad_pipelines4.yaml
index 7f58024..3a91604 100644
--- a/tests/fixtures/layouts/bad_pipelines4.yaml
+++ b/tests/fixtures/layouts/bad_pipelines4.yaml
@@ -3,6 +3,7 @@
     manager: IndependentPipelineManager
     trigger:
       gerrit:
+        # non-event is not a valid gerrit event
         - event: non-event
 
 projects: