Add --log-exit-as arg

Logs exit as JSON, then exits rather than simply crashing out

Gemfile.lock

@@ -388,7 +388,7 @@ GEM
       opentracing (~> 0.4)
       redis (> 3.0.0, < 5.0.0)
     gitlab-license (1.0.0)
-    gitlab-mail_room (0.0.1)
+    gitlab-mail_room (0.0.2)
     gitlab-markup (1.7.0)
     gitlab-net-dns (0.9.1)
     gitlab-puma (4.3.1.gitlab.2)
@@ -1235,7 +1235,7 @@ DEPENDENCIES
   gitlab-chronic (~> 0.10.5)
   gitlab-labkit (= 0.10.0)
   gitlab-license (~> 1.0)
-  gitlab-mail_room (~> 0.0.1)
+  gitlab-mail_room (~> 0.0.2)
   gitlab-markup (~> 1.7.0)
   gitlab-net-dns (~> 0.9.1)
   gitlab-puma (~> 4.3.1.gitlab.2)

bin/mail_room

@@ -19,7 +19,7 @@ get_mail_room_pid()
 
 start()
 {
-  bin/daemon_with_pidfile $mail_room_pidfile bundle exec mail_room -q -c $mail_room_config >> $mail_room_logfile 2>&1
+  bin/daemon_with_pidfile $mail_room_pidfile bundle exec mail_room --log-exit-as json -q -c $mail_room_config >> $mail_room_logfile 2>&1
 }
 
 stop()