Comment 0 for bug 1267300

In nova/utils.py, a func use the "type" method to determine the type. It's bertter to use the "isinstance" method instead.
The code is:
def convert_version_to_int(version):
    try:
        if type(version) == str:
            version = convert_version_to_tuple(version)
       if type(version) == tuple:
           return reduce(lambda x, y: (x * 1000) + y, version)
    except Exception:
           raise exception.NovaException(message="Hypervisor version invalid.")

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