A bit of tidying up libs/util.py
A bit of tidying up libs/util.py

Signed-off-by: Kostas Ladopoulos <7920ee5edb7fd3a4c6c6e3ebe9bd13d4a7f2eff1@citrix.com>

stefanopanella/xapi-storage-plugins,stefanopanella/xapi-storage-plugins,stefanopanella/xapi-storage-plugins