AD/LDAP sync - Interrupt an executing job

The ability to stop an executing AD/LDAP sync job would make it easier when running and testing any changes to the sync job parameters. It has happened a couple of times that we have made some changes to the LDAP filters which resulted in a large number of users being fetched and added to device42. We then need do a cleanup, which is made more difficult as we were not able to stop the errant job before it adds those many users.