Stop setting route pointing back to tenant router

This removes the logic to add a route pointing to the IPv4
tenant private network range since the router is performing
SNAT. If reaching the IPs via the route worked at all, it was
by accident since this behavior is certainly not guaranteed
by Neutron.

Change-Id: If45e3fc15c050cfbac11b57c1eaf137dd7ed816f
diff --git a/lib/neutron_plugins/services/l3 b/lib/neutron_plugins/services/l3
index aa61a10..e9ee03f 100644
--- a/lib/neutron_plugins/services/l3
+++ b/lib/neutron_plugins/services/l3
@@ -373,11 +373,6 @@
             fi
             ROUTER_GW_IP=$(neutron --os-cloud devstack-admin --os-region "$REGION_NAME" port-list -c fixed_ips -c device_owner | grep router_gateway | awk -F'ip_address'  '{ print $2 }' | cut -f3 -d\" | tr '\n' ' ')
             die_if_not_set $LINENO ROUTER_GW_IP "Failure retrieving ROUTER_GW_IP"
-            local replace_range=${SUBNETPOOL_PREFIX_V4}
-            if [[ -z "${SUBNETPOOL_V4_ID}" ]]; then
-                replace_range=${FIXED_RANGE}
-            fi
-            sudo ip route replace $replace_range via $ROUTER_GW_IP
         fi
         _neutron_set_router_id
     fi