Don't return redundant request + response types in metadata.GetAllTypes()
Don't return redundant request + response types in metadata.GetAllTypes()

nataren/NServiceKit,timba/NServiceKit,nataren/NServiceKit,ZocDoc/ServiceStack,ZocDoc/ServiceStack,NServiceKit/NServiceKit,MindTouch/NServiceKit,MindTouch/NServiceKit,ZocDoc/ServiceStack,NServiceKit/NServiceKit,nataren/NServiceKit,MindTouch/NServiceKit,timba/NServiceKit,NServiceKit/NServiceKit,timba/NServiceKit,NServiceKit/NServiceKit,MindTouch/NServiceKit,nataren/NServiceKit,ZocDoc/ServiceStack,timba/NServiceKit