add http and cache as expected keys for globals configuration
add http and cache as expected keys for globals configuration

drnextgis/mapproxy,Anderson0026/mapproxy,faegi/mapproxy,olt/mapproxy,kaiCu/mapproxy,faegi/mapproxy,camptocamp/mapproxy,vrsource/mapproxy,mapproxy/mapproxy,drnextgis/mapproxy,procrastinatio/mapproxy,kaiCu/mapproxy,vrsource/mapproxy,mapproxy/mapproxy,camptocamp/mapproxy,geoadmin/mapproxy,geoadmin/mapproxy,Anderson0026/mapproxy,olt/mapproxy,procrastinatio/mapproxy