Add support for specifying Mongo authentication database
Add support for specifying Mongo authentication database

EDUlib/configuration,EDUlib/configuration,appsembler/configuration,mitodl/configuration,EDUlib/configuration,stvstnfrd/configuration,appsembler/configuration,stvstnfrd/configuration,EDUlib/configuration,stvstnfrd/configuration,mitodl/configuration,arbrandes/edx-configuration,edx/configuration,appsembler/configuration,mitodl/configuration,EDUlib/configuration,arbrandes/edx-configuration,edx/configuration,mitodl/configuration,stvstnfrd/configuration,edx/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,appsembler/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,edx/configuration