Clean up entire /run/ipa/ccaches directory not just files
    
    If there are any sub-directories in the ccaches directory
    then cleaning it up will fail.
    
    Instead remove the whole directory and allow systemd-tmpfiles
    to re-create it.
    
    https://pagure.io/freeipa/issue/8248
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>