typo in lib/utils.pm
    
    reported in autoinst-log.txt
    ===
    "my" variable $files masks earlier declaration in same scope at /var/lib/openqa/share/tests/fedora/lib/utils.pm line 352.
    "my" variable $beta masks earlier declaration in same scope at /var/lib/openqa/share/tests/fedora/lib/utils.pm line 995.
    ===
    
    Signed-off-by: Michel Normand <normand@linux.vnet.ibm.com>