Add overflow check to find_config_int()

find_config_int() and find_config_tree_int() are the function to search throught the config tree and return the found value or given default on failure.

Internally, the values are int64_t but implicitly casted to int on return.

Though I think it doesn't matter in realistic configs, it's better to check them and leave explicit log message.

Thanks,

Jun'ichi Nomura, NEC Corporation of America
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