Added STC shutdown scenario.

Change-Id: I48b882c872f69fdd84fe2fd057163e68ffb58012
diff --git a/tools/package/debian/onos.conf b/tools/package/debian/onos.conf
index 85c210d..634a263 100644
--- a/tools/package/debian/onos.conf
+++ b/tools/package/debian/onos.conf
@@ -15,8 +15,8 @@
 #env NEW_JAVA_HOME=/usr/lib/jvm/java-8-oracle/
 
 pre-stop script
-    /opt/onos/bin/onos halt 2>/opt/onos/var/stderr.log
-    sleep 2
+    /opt/onos/bin/onos halt 2>>/opt/onos/var/stderr.log
+    sleep 1
 end script
 
 script