Add HAProxy configuration for Octavia

Change-Id: I668c6d76e5c9ea932d6f2c39becb91fc4df6c4af
diff --git a/octavia/api/single.yml b/octavia/api/single.yml
new file mode 100644
index 0000000..685c4b4
--- /dev/null
+++ b/octavia/api/single.yml
@@ -0,0 +1,8 @@
+classes:
+- service.octavia.api.single
+parameters:
+  octavia:
+    api:
+      enabled: true
+      bind:
+        address: ${_param:single_address}