fix: used wrong terminology for diskspace

This fixes error that available diskspace is shown as used diskspace.

In reallity it should show available and using available instead of
used.

Thanks to mallcop for reporting

Signed-off-by: Stephan Wendel <me@stephanwe.de>

libs/logging.sh

@@ -152,7 +152,7 @@ function print_host {
         ## Avail mem
         log_msg "Host Info: Available Memory: ${memtotal}"
         ## Avail disk size
-        log_msg "Host Info: Diskspace (used / total): ${disksize}"
+        log_msg "Host Info: Diskspace (avail. / total): ${disksize}"
     fi
 }