autotest: handle Py2 not having ConnectionResetError built in

Tools/autotest/ardusub.py

@@ -3,12 +3,17 @@
 # Dive ArduSub in SITL
 from __future__ import print_function
 import os
+import sys
 import time
 
 from pymavlink import mavutil
 
 from common import AutoTest
 from common import NotAchievedException
+from common import AutoTestTimeoutException
+
+if sys.version_info[0] < 3:
+    ConnectionResetError = AutoTestTimeoutException
 
 # get location of scripts
 testdir = os.path.dirname(os.path.realpath(__file__))

Tools/autotest/common.py

@@ -91,6 +91,10 @@ class AutoTestTimeoutException(ErrorException):
     pass
 
 
+if sys.version_info[0] < 3:
+    ConnectionResetError = AutoTestTimeoutException
+
+
 class WaitModeTimeout(AutoTestTimeoutException):
     """Thrown when fails to achieve given mode change."""
     pass
@@ -1559,6 +1563,11 @@ class AutoTest(ABC):
                 pass
             except ConnectionResetError:
                 pass
+            except socket.error:
+                pass
+            except Exception as e:
+                self.progress("Got unexpected exception (%s)" % str(type(e)))
+                pass
 
         # empty mav to avoid getting old timestamps:
         self.do_timesync_roundtrip(timeout_in_wallclock=True)