Add task list execution story

features/executeTaskList.feature

+As user
+I want to execute the list of tasks
+So I am able to bring the consistensy to running multiple asyncronous tasks
+
+Scenario: Sequential task list processing
+Given long running policy is uploaded to the system
+And the list of tasks is defined
+And the list of tasks contains the group of tasks
+And the group of tasks contains task A and task B
+When I evaluate a policy
+And the task list specified as an input
+Then I get successful response
+And the response contains the taskListObject
+And the taskListObject contains the taskList id
+And the taskListObject contains the taskIDs of all the tasks
+
+Scenario: Handling the error for the sequential task list execution
+Given task list is configured
+And the list of tasks contains the group of tasks
+And the group of tasks contains task A, task B and task C
+And the group of tasks is configured for running one by one
+And the task list has executed
+And task B failed
+When I request the result of task list execution
+Then I get the response
+And the status of task list execution marked as failed
+And the status of task A is marked as successful
+And the status of task B is marked as failed
+And the status of task C is marked as failed
+
+Scenario: Handling the error for the parallel task list execution
+Given task list is configured
+And the list of tasks contains the group of tasks
+And the group of tasks contains task A, task B and task C
+And the group of tasks is configured for running in parallel
+And the task list has executed
+And task B failed
+When I request the result of task list execution
+Then I get the response
+And the status of task list execution marked as failed
+And the status of task A is marked as successful
+And the status of task B is marked as failed
+And the status of task C is marked as successful
+
+Scenario: Handling the error for the mixed task list execution
+Given task list is configured
+And the list of tasks contains the group A and group B
+And the group A configured for running sequentially
+And the group B configured for running in parallel
+And the task list has executed
+And one of the tasks in a group B failed
+When I request the result of the task list execution
+Then I get the response
+And the status of task list execution marked as failed
+
+