9118164 Fix fmf_get invocation in standard-inventory-qcow2 provision script.

Authored and Committed by astepano 6 years ago
    Fix fmf_get invocation in standard-inventory-qcow2 provision script.
    
    In fmf_get(path, default=None) `default` should have type str.
    Fix invocation.
    
    Signed-off-by: Andrei Stepanov <astepano@redhat.com>