Fix reference to the nodes_uri param

Currently in the reclass-config.yml template we are trying to
reference an undefined variable.

This change fixes the variable and adds a test that would have caught
this issue.

Fixes PROD-13303

Change-Id: I17cd5410002b6f4172545a6946d76b7c5711a122
diff --git a/tests/pillar/storage_nodes_uri.sls b/tests/pillar/storage_nodes_uri.sls
new file mode 100644
index 0000000..dc461fd
--- /dev/null
+++ b/tests/pillar/storage_nodes_uri.sls
@@ -0,0 +1,7 @@
+reclass:
+  storage:
+    enabled: true
+    base_dir: /srv/reclass
+    nodes_uri: /srv/reclass/foo/nodes
+    data_source:
+      engine: local