Revert "servo: Use new connections for each servod RPC."

This is causing initialization timeouts in some cases when
using `repair_test`.

This reverts commit 69d17c06245f038992a4a9cb4a96e2419b75ee95.

BUG=670469
TEST=call `verify()` on a servo host.

Change-Id: I13c9758999f901e56e2ad33c6be78157dce127ba
Reviewed-on: https://chromium-review.googlesource.com/416191
Commit-Queue: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>
diff --git a/server/cros/servo/servo.py b/server/cros/servo/servo.py
index d30ef8b..fd91a95 100644
--- a/server/cros/servo/servo.py
+++ b/server/cros/servo/servo.py
@@ -173,13 +173,11 @@
         # to minimize the dependencies on the rest of Autotest.
         self._servo_host = servo_host
         self._servo_serial = servo_serial
+        self._server = servo_host.get_servod_server_proxy()
         self._power_state = _PowerStateController(self)
         self._usb_state = None
         self._programmer = None
 
-    @property
-    def _server(self):
-        return self._servo_host.get_servod_server_proxy()
 
     @property
     def servo_serial(self):