[autotest] Log servo version at initialization

For debug purposes:  When initializing servo, log the servo
(hardware) version returned by servod.

BUG=None
TEST=run a servo test using test_that with this change present

Change-Id: I1abe8d79ff9f6915a33075511055f6aeee51ab79
Reviewed-on: https://chromium-review.googlesource.com/216283
Commit-Queue: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Yusuf Mohsinally <mohsinally@chromium.org>
diff --git a/server/cros/servo/servo.py b/server/cros/servo/servo.py
index 2e55df5..7ec89b4 100644
--- a/server/cros/servo/servo.py
+++ b/server/cros/servo/servo.py
@@ -211,6 +211,8 @@
         self.switch_usbkey('off')
         if cold_reset:
             self._power_state.reset()
+        logging.debug('Servo initialized, version is %s',
+                      self._server.get_version())
 
 
     def is_localhost(self):
@@ -379,13 +381,6 @@
         time.sleep(Servo.BOOT_DELAY)
 
 
-    def get_version(self):
-        """Get the version of servod board.
-
-        """
-        return self._server.get_version()
-
-
     def get_board(self):
         """Get the board connected to servod.
 
@@ -627,7 +622,7 @@
         if self._programmer:
             return
         # Initialize firmware programmer
-        servo_version = self.get_version()
+        servo_version = self._server.get_version()
         if servo_version == 'servo_v2':
             self._programmer = firmware_programmer.ProgrammerV2(self)
         else: