autotest: Remove readonly_password globally

See bug, this is believed to have no effect.

BUG=chromium:632906
TEST=None

Change-Id: I099a9222fb45085ef5f4cd6227954284e0950505
Reviewed-on: https://chromium-review.googlesource.com/1053406
Commit-Ready: Jacob Kopczynski <jkop@chromium.org>
Tested-by: Jacob Kopczynski <jkop@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
diff --git a/global_config.ini b/global_config.ini
index 109c997..fb40cc6 100644
--- a/global_config.ini
+++ b/global_config.ini
@@ -12,7 +12,7 @@
 #base_url: http://your_autotest_server/afe/
 readonly_host: localhost
 readonly_user: chromeosqa-read
-readonly_password: qyBM6kDu
+readonly_password:
 query_timeout: 3600
 min_retry_delay: 20
 max_retry_delay: 60