Fixed unconditioned source phase in OpenDaylight extras

Should source ``lib/opendaylight`` in ``extras.d/80-opendaylight.sh``
only when appropriate services are enabled.
Fix for bug/1290033

Change-Id: Ifa470e1e132029f3c5bf255f27c4e96373b339a8
Signed-off-by: Roey Chen <roeyc@mellanox.com>
diff --git a/extras.d/80-opendaylight.sh b/extras.d/80-opendaylight.sh
index cc5c8de..57b4328 100644
--- a/extras.d/80-opendaylight.sh
+++ b/extras.d/80-opendaylight.sh
@@ -1,7 +1,9 @@
 # opendaylight.sh - DevStack extras script
 
-# Need this first to get the is_***_enabled for ODL
-source $TOP_DIR/lib/opendaylight
+if is_service_enabled odl-server odl-compute; then
+    # Initial source
+    [[ "$1" == "source" ]] && source $TOP_DIR/lib/opendaylight
+fi
 
 if is_service_enabled odl-server; then
     if [[ "$1" == "source" ]]; then