Create nodepool inventory variables

Because we want jobs to know something about the provider they are
running on, expose nodepool variables in the inventory file.

Change-Id: I18c8b414b1bbb114d55d21c5ae77d6348b3e9080
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/tests/unit/test_v3.py b/tests/unit/test_v3.py
index 3d83ea5..5c0679d 100644
--- a/tests/unit/test_v3.py
+++ b/tests/unit/test_v3.py
@@ -266,6 +266,8 @@
         self.assertEqual(build.result, 'ABORTED')
         build = self.getJobFromHistory('faillocal')
         self.assertEqual(build.result, 'FAILURE')
+        build = self.getJobFromHistory('nodepool')
+        self.assertEqual(build.result, 'SUCCESS')
         build = self.getJobFromHistory('python27')
         self.assertEqual(build.result, 'SUCCESS')
         flag_path = os.path.join(self.test_root, build.uuid + '.flag')