Remove main.yaml

Nothing uses this file.

Change-Id: I096f2e2f68dc1be38ad3996e491192233418a330
diff --git a/tests/fixtures/main.yaml b/tests/fixtures/main.yaml
deleted file mode 100644
index f9ec378..0000000
--- a/tests/fixtures/main.yaml
+++ /dev/null
@@ -1,4 +0,0 @@
-tenants:
-  - name: openstack
-    include:
-      - layout.yaml