retrace: create user/group in advance
    
    addressing:
    TASK [abrt/retrace-pre : file] ******************************************************************************************
    Friday 20 March 2020  09:02:34 +0000 (0:00:00.056)       0:05:28.187 **********
    fatal: [retrace-stg.aws.fedoraproject.org]: FAILED! => {"ansible_facts": {"discovered_interpreter_python": "/usr/libexec/platform-python"}, "changed": false, "gid": 0, "group": "root", "mode": "0755", "msg": "chown failed: failed to look up user retrace", "owner": "root", "path": "/srv/retrace/repos", "secontext": "unconfined_u:object_r:var_t:s0", "size": 4096, "state": "directory", "uid": 0}