Callback manager: set all leds each time

The led-manager priority doesn't work as well as we'd
hoped and we can occasionally see both blinking yellow
and green at the same time. To fix this handle priorities
in the callback manager.

Tested-by: Set warning and critical at the same time, only
saw critcial.

Change-Id: If0c5b7c2411ca1fd3dc74e407773e8f56e6c675f
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/callback-manager/service_files/callback-manager.service b/callback-manager/service_files/callback-manager.service
index b6abae3..3b82395 100644
--- a/callback-manager/service_files/callback-manager.service
+++ b/callback-manager/service_files/callback-manager.service
@@ -1,6 +1,7 @@
 [Unit]
 Description=Callback Manager
 StopWhenUnneeded=false
+After=xyz.openbmc_project.LED.GroupManager.service
 
 [Service]
 Type=dbus