Bind nova-api to private IP

The patch makes the change which binds nova-api to
private IP to avoid conflicting with HAproxy.

Change-Id: Ib845f889ca93bdb0bb697cf710d44362cc9e5ccc
diff --git a/nova/files/queens/nova-controller.conf.Debian b/nova/files/queens/nova-controller.conf.Debian
index 2e725ad..8883c82 100644
--- a/nova/files/queens/nova-controller.conf.Debian
+++ b/nova/files/queens/nova-controller.conf.Debian
@@ -3191,6 +3191,7 @@
 # requests.
 #  (string value)
 #osapi_compute_listen = 0.0.0.0
+osapi_compute_listen = {{ controller.bind.private_address }}
 
 #
 # Port on which the OpenStack API will listen.