Enable placement section on controller in multinode setup

Currently placement api section will be configured on controller
only if service n-cpu is running. It breaks multi node setup.
Closes-Bug: #1667219

Change-Id: I8b0f60f253859f704bb9831d7dac8f55df353ac7
diff --git a/stack.sh b/stack.sh
index 7d440a7..9a0cec6 100755
--- a/stack.sh
+++ b/stack.sh
@@ -872,7 +872,7 @@
 # if placement-api or placement-client is active, and n-cpu on the
 # same box.
 if is_service_enabled placement placement-client; then
-    if is_service_enabled n-cpu; then
+    if is_service_enabled n-cpu || is_service_enabled n-sch; then
         configure_placement_nova_compute
     fi
 fi