Fix missing "$" in the ENFORCE_SCOPE's variable name

Because of the missing "$" before ENFORCE_SCOPE in the lib/neutron
module, it was treated as an ENFORCE_SCOPE string instead of variable
and Neutron was deployed always with old defaults and disabled scope
enforcement.

Change-Id: Ibe67fea634c5f7abb521c0369ff30dd5db84db8c
diff --git a/lib/neutron b/lib/neutron
index 1b78493..2d77df6 100644
--- a/lib/neutron
+++ b/lib/neutron
@@ -633,7 +633,7 @@
 # configure_rbac_policies() - Configure Neutron to enforce new RBAC
 # policies and scopes if NEUTRON_ENFORCE_SCOPE == True
 function configure_rbac_policies {
-    if [[ "$NEUTRON_ENFORCE_SCOPE" == "True" || "ENFORCE_SCOPE" == "True" ]]; then
+    if [[ "$NEUTRON_ENFORCE_SCOPE" == "True" || "$ENFORCE_SCOPE" == "True" ]]; then
         iniset $NEUTRON_CONF oslo_policy enforce_new_defaults True
         iniset $NEUTRON_CONF oslo_policy enforce_scope True
     else