Cleanup timer callback plugin's overwriting of modules it imported

lib/ansible/plugins/callback/timer.py

@@ -2,12 +2,11 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-import os
-import datetime
-from datetime import datetime, timedelta
+from datetime import datetime
 
 from ansible.plugins.callback import CallbackBase
 
+
 class CallbackModule(CallbackBase):
     """
     This callback module tells you how long your plays ran for.
@@ -22,16 +21,15 @@ class CallbackModule(CallbackBase):
 
         self.start_time = datetime.now()
 
-    def days_hours_minutes_seconds(self, timedelta):
-        minutes = (timedelta.seconds//60)%60
-        r_seconds = timedelta.seconds - (minutes * 60)
-        return timedelta.days, timedelta.seconds//3600, minutes, r_seconds
+    def days_hours_minutes_seconds(self, runtime):
+        minutes = (runtime.seconds // 60) % 60
+        r_seconds = runtime.seconds - (minutes * 60)
+        return runtime.days, runtime.seconds // 3600, minutes, r_seconds
 
     def playbook_on_stats(self, stats):
         self.v2_playbook_on_stats(stats)
 
     def v2_playbook_on_stats(self, stats):
         end_time = datetime.now()
-        timedelta = end_time - self.start_time
-        self._display.display("Playbook run took %s days, %s hours, %s minutes, %s seconds" % (self.days_hours_minutes_seconds(timedelta)))
-
+        runtime = end_time - self.start_time
+        self._display.display("Playbook run took %s days, %s hours, %s minutes, %s seconds" % (self.days_hours_minutes_seconds(runtime)))