Go back to the default method of stopping workers
Go back to the default method of stopping workers

We had a persistent problem of workers getting stuck when trying to stop
during 12.04 native installation.  This fixes the problem, while still
allowing active tasks to complete.

This reverts pull request #2133, and removes the stopasgroup setting
that was causing the trouble.

openfun/configuration,nunpa/configuration,rue89-tech/configuration,stvstnfrd/configuration,hks-epod/configuration,jorgeomarmh/configuration,hastexo/edx-configuration,nunpa/configuration,marcore/configuration,michaelsteiner19/open-edx-configuration,EDUlib/configuration,hks-epod/configuration,hastexo/edx-configuration,hks-epod/configuration,armaan/edx-configuration,appsembler/configuration,Stanford-Online/configuration,gsehub/configuration,appsembler/configuration,edx/configuration,Livit/Livit.Learn.EdX.configuration,jorgeomarmh/configuration,proversity-org/configuration,michaelsteiner19/open-edx-configuration,rue89-tech/configuration,mitodl/configuration,EDUlib/configuration,openfun/configuration,openfun/configuration,appsembler/configuration,appsembler/configuration,stvstnfrd/configuration,marcore/configuration,proversity-org/configuration,hastexo/edx-configuration,Livit/Livit.Learn.EdX.configuration,Stanford-Online/configuration,Livit/Livit.Learn.EdX.configuration,rue89-tech/configuration,gsehub/configuration,Stanford-Online/configuration,open-craft/configuration,jorgeomarmh/configuration,stvstnfrd/configuration,EDUlib/configuration,rue89-tech/configuration,mitodl/configuration,arbrandes/edx-configuration,hks-epod/configuration,arbrandes/edx-configuration,proversity-org/configuration,mitodl/configuration,michaelsteiner19/open-edx-configuration,open-craft/configuration,nunpa/configuration,edx/configuration,arbrandes/edx-configuration,open-craft/configuration,hastexo/edx-configuration,nunpa/configuration,armaan/edx-configuration,proversity-org/configuration,arbrandes/edx-configuration,EDUlib/configuration,stvstnfrd/configuration,mitodl/configuration,gsehub/configuration,marcore/configuration,armaan/edx-configuration,Stanford-Online/configuration,jorgeomarmh/configuration,stvstnfrd/configuration,marcore/configuration,Livit/Livit.Learn.EdX.configuration,gsehub/configuration,gsehub/configuration,edx/configuration,openfun/configuration,open-craft/configuration,hks-epod/configuration,arbrandes/edx-configuration,rue89-tech/configuration,hastexo/edx-configuration,michaelsteiner19/open-edx-configuration,EDUlib/configuration,armaan/edx-configuration,proversity-org/configuration,edx/configuration,Stanford-Online/configuration