nodepool: Add nb01-test.opendev.org config file

This config file is only used by the system-config-run-nodepool test
in the gate.  We want to keep this config file in project-config so
that we can deploy all the configuration parts in that test without
special paths and as if nb01-test.opendev.org was a production host.

Change-Id: Ie500bd0d58d0616240b627d1328be36087467864
Needed-By: https://review.opendev.org/710888

nodepool/nb01-test.opendev.org.yaml

@@ -0,0 +1,17 @@
+# Note this is only used by the system-config-run-nodepool job for
+# testing purposes only.  It lives here because we want to test the
+# configuration deployment with unmodified project-config.
+---
+
+elements-dir: /etc/nodepool/elements
+images-dir: /opt/nodepool_dib
+
+zookeeper-servers:
+  - host: localhost
+    port: 2181
+
+diskimages: []
+
+labels: []
+
+providers: []