Hello!

Today I noticed that approx. half of the CentOS 8-stream nodes our CI got its hands on today were missing `dnf`:

``` 2019-11-29 09:34:59,493 [agent-control/allocate_node] INFO: Attempting to allocate a node (8-stream x86_64) 2019-11-29 09:34:59,493 [agent-control/_execute_api_command] INFO: Duffy request URL: http://admin.ci.centos.org:8080/Node/get 2019-11-29 09:34:59,507 [connectionpool/_new_conn] INFO: Starting new HTTP connection (1): admin.ci.centos.org 2019-11-29 09:35:00,669 [agent-control/allocate_node] INFO: Successfully allocated node 'n29.pufty' (e819a934) 2019-11-29 09:35:00,669 [agent-control/<module>] INFO: PHASE 1: Setting up basic dependencies to configure CI repository ... Pseudo-terminal will not be allocated because stdin is not a terminal. Warning: Permanently added 'n29.pufty,172.19.3.93' (ECDSA) to the list of known hosts. bash: dnf: command not found ```

I'm not sure if it's already known, but it's indeed quite strange :-)

Thanks!