Use 'common.yml' as environment-specific values provider to nodes

Change-Id: I81a6d6cc48e52f4679b1b3b05e43cf8b0a3af42b
diff --git "a/examples/environment/\173\173 cookiecutter.cluster_name \175\175/common.yml" "b/examples/environment/\173\173 cookiecutter.cluster_name \175\175/common.yml"
new file mode 100644
index 0000000..cbf1423
--- /dev/null
+++ "b/examples/environment/\173\173 cookiecutter.cluster_name \175\175/common.yml"
@@ -0,0 +1,7 @@
+parameters:
+  _param:
+  # Put any environment-specific variables here
+
+  linux:
+    network:
+      interface: ${_param:linux_network_interfaces}