[autotest] Add [SERVER] global_afe_hostname for global_config.ini

BUG=chromium:524678
TEST=None

Change-Id: I4fbd2beeb5afe2c941045b1346330a4d268b5d69
Reviewed-on: https://chromium-review.googlesource.com/295547
Trybot-Ready: Mungyung Ryu <mkryu@google.com>
Tested-by: Mungyung Ryu <mkryu@google.com>
Reviewed-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Mungyung Ryu <mkryu@google.com>
diff --git a/global_config.ini b/global_config.ini
index d5d96c8..459ddc4 100644
--- a/global_config.ini
+++ b/global_config.ini
@@ -132,6 +132,9 @@
 # If no specified, will default to [SERVER]: hostname
 suite_scheduler_afe:
 
+# AFE server connected to the master DB.
+global_afe_hostname: cautotest
+
 [SCHEDULER]
 die_on_orphans: False
 enable_scheduler: True