yum module enable idm:DL1 를 쳤을때 에러가 발생했을경우 해결방법입니다.
The operation would result in switching of module 'idm' stream 'client' to
stream 'DL1'
Error: It is not possible to switch enabled streams of a module unless
explicitly enabled via configuration option module_stream_switch.
It is recommended to rather
