make service_check fatal

if we fail service check, we should do so in a fatal way, because
something is not right. This will be very useful in grenade.

Change-Id: I18811b0d8e6d06f364685c366cdc8f5dda3b8f7e
diff --git a/functions-common b/functions-common
index 2248fbb..ab7bc21 100644
--- a/functions-common
+++ b/functions-common
@@ -1135,7 +1135,7 @@
     done
 
     if [ -n "$failures" ]; then
-        echo "More details about the above errors can be found with screen, with ./rejoin-stack.sh"
+        die $LINENO "More details about the above errors can be found with screen, with ./rejoin-stack.sh"
     fi
 }