Updated mongo role in edx CI playbook
Updated mongo role in edx CI playbook

edx/configuration,mitodl/configuration,arbrandes/edx-configuration,edx/configuration,mitodl/configuration,mitodl/configuration,edx/configuration,edx/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,mitodl/configuration,arbrandes/edx-configuration