Remove task inspection from task manager app

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/task_manager/classes.py

@@ -6,9 +6,6 @@ import logging
 
 from kombu import Exchange, Queue
 
-from celery.five import monotonic
-from celery.task.control import inspect
-
 from django.apps import apps
 from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.module_loading import import_string
@@ -62,18 +59,10 @@ class Task(object):
     def __str__(self):
         return force_text(self.task_type)
 
-    def get_time_started(self):
-        time_start = self.kwargs.get('time_start')
-        if time_start:
-            return now() - timedelta(seconds=monotonic() - self.kwargs['time_start'])
-        else:
-            return None
-
 
 @python_2_unicode_compatible
 class CeleryQueue(object):
     _registry = {}
-    _inspect_instance = inspect()
 
     @staticmethod
     def initialize():
@@ -132,21 +121,6 @@ class CeleryQueue(object):
         self.task_types.append(task_type)
         return task_type
 
-    def get_active_tasks(self):
-        return self._process_task_dictionary(
-            task_dictionary=self.__class__._inspect_instance.active()
-        )
-
-    def get_reserved_tasks(self):
-        return self._process_task_dictionary(
-            task_dictionary=self.__class__._inspect_instance.reserved()
-        )
-
-    def get_scheduled_tasks(self):
-        return self._process_task_dictionary(
-            task_dictionary=self.__class__._inspect_instance.scheduled()
-        )
-
     def _update_celery(self):
         kwargs = {
             'name': self.name, 'exchange': Exchange(self.name),