[Sahara] Set use_floating_ips=false for nova network

There is no sense in using floating IPs in case of nova network.
Sahara doesn't support assigning floating IPs from
default_floating_pool. The best solution is to use private network
for management.

Change-Id: I4b3e1d52cab28fe5c8d398ca896216b47b9c4ee0
Closes-Bug: #1403680
diff --git a/lib/sahara b/lib/sahara
index 6d1bef5..e5f988b 100644
--- a/lib/sahara
+++ b/lib/sahara
@@ -131,6 +131,9 @@
     if is_service_enabled neutron; then
         iniset $SAHARA_CONF_FILE DEFAULT use_neutron true
         iniset $SAHARA_CONF_FILE DEFAULT use_floating_ips true
+    else
+        iniset $SAHARA_CONF_FILE DEFAULT use_neutron false
+        iniset $SAHARA_CONF_FILE DEFAULT use_floating_ips false
     fi
 
     if is_service_enabled heat; then