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Various utility functions.
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Iterate through module names found in ``src_dir``.
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See if the hostname has a DNS A record.
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c C s t | d j o t t d n | i d o | d } n d | j o t t d n d | j o1 | o t t d n t | | | n t | | | d S( su See RFC 952, 1123
:param hostname Checked value
:param check_fqdn Check if hostname is fully qualified
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