Add support for quiet in Upstart

examples/upstart/sidekiq.conf

@@ -11,6 +11,10 @@
 #   sudo stop sidekiq index=0
 #   sudo status sidekiq index=0
 #
+# Hack Upstart's reload command to 'quiet' Sidekiq:
+#
+#   sudo reload sidekiq index=0
+#
 # or use the service command:
 #   sudo service sidekiq {start,stop,restart,status}
 #
@@ -33,6 +37,7 @@ respawn limit 3 30
 # TERM is sent by sidekiqctl when stopping sidekiq. Without declaring these as
 # normal exit codes, it just respawns.
 normal exit 0 TERM
+reload signal USR1
 
 instance $index