dev_server: Fix timeout value

As we changed the timeout to 100 mins in is_staged polling, this
patch fixed the one in remote_devserver_call which governs the
overall timeout in decorator.

BUG=chromium:620822
TEST=None

Change-Id: Ibdc4adb28aba91f948dbeb38bc3bd14acb604f34
Signed-off-by: Chung-yih Wang <cywang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/353560
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>
Reviewed-by: Ben Cheng <bccheng@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
diff --git a/client/common_lib/cros/dev_server.py b/client/common_lib/cros/dev_server.py
index fcf1297..2fb90ac 100644
--- a/client/common_lib/cros/dev_server.py
+++ b/client/common_lib/cros/dev_server.py
@@ -148,7 +148,7 @@
         default=[])
 
 
-def remote_devserver_call(timeout_min=30):
+def remote_devserver_call(timeout_min=DEVSERVER_IS_STAGING_RETRY_MIN):
     """A decorator to use with remote devserver calls.
 
     This decorator converts urllib2.HTTPErrors into DevServerExceptions