Description of problem:

When trying to delete a repo group, the following exception is raised:

PulpCodedException: Working Directory requested outside of asynchronous task.

Version-Release number of selected component (if applicable):

Probably a regression, new in master.

How reproducible:

Always

Steps to Reproduce:

1. Create a repo group

    $ pulp-admin repo group create --group-id new_group

    Repository Group [new_group] successfully created

2.Try to delete it

    $ pulp-admin repo group delete --group-id new_group

    An internal error occurred on the Pulp server:

    RequestException: DELETE request
    on /pulp/api/v2/repo_groups/new_group/ failed with 500 - Working Directory
    requested outside of asynchronous task. 



Actual results:

    An internal error occurred on the Pulp server:

    RequestException: DELETE request
    on /pulp/api/v2/repo_groups/new_group/ failed with 500 - Working Directory
    requested outside of asynchronous task. 


Expected results:

    Successful delete.

Additional info:

Problem occurs in server/pulp/server/managers/repo/group/cud.py, line 171. This delete should be taking place asynchronously in a task, rather than synchronously.