Description of problem:

If a previous import attempt left an importer created on pulp and a new import task is created with the same source tarball, the new task fails complaining about the importer already being created.

There's no easy way to cleanup the importer (from a user perspective).

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

How reproducible:

Steps to Reproduce:
1. Start an import task
2. make the import task fail unexpectedly (kill the worker importing it, for example)
3. cancel/cleanup the task (if you skip the failed step and resume, the importer will be removed)
4. Cleanup the imported CV on Satellite
5. Try importing again

Actual results:

~~~

1. hammer content-import version --organization-id 5 --path /var/lib/pulp/imports/test3_kickstart_rhel7/1.0/2022-01-14T11-34-09-05-00/
   [............................. ] [13%]
   Error: Error message: the server returns an error
   HTTP status code: 400
   Response headers: {"Date"=>"Thu, 20 Jan 2022 21:48:48 GMT", "Server"=>"gunicorn", "Content-Type"=>"application/json", "Vary"=>"Accept,Cookie", "Allow"=>"GET, POST, HEAD, OPTIONS", "X-Frame-Options"=>"SAMEORIGIN", "Content-Length"=>"39", "Correlation-ID"=>"28a90f8e-405b-444c-ba13-c80d62b06632", "Access-Control-Expose-Headers"=>"Correlation-ID", "Via"=>"1.1 bombsat610.usersys.redhat.com", "Connection"=>"close"}

   Response body:

   {"name":["This field must be unique."]}

   ~~~

Expected results:

Import should work anyway or at least return a more meaningful error.