Fix check for fedora user image. This error was non-fatal, but through an error message.
Fix check for fedora user image. This error was non-fatal, but through an error
message.

agroup/instack-undercloud,eprasad/instack-undercloud,eprasad/instack-undercloud,bcrochet/instack-undercloud,dpkshetty/instack-undercloud,rdo-management/instack-undercloud,dmsimard/instack-undercloud,rdo-management/instack-undercloud,dpkshetty/instack-undercloud,agroup/instack-undercloud,dmsimard/instack-undercloud,bcrochet/instack-undercloud