Updated discovery service to use pylibmc instead of python-memcached
Updated discovery service to use pylibmc instead of python-memcached

python-memcached seems to have sporadic issues with Python 3.5.

ECOM-4370

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