dnstable_lookup: validate DNSTABLE_SETFILE before use - #101
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Pointing DNSTABLE_SETFILE at an mtbl data file instead of a set file read the
whole file looking for pathnames and silently returned nothing; it now fails
immediately, and data files that cannot be reached are reported to stderr.
Adds DNSTABLE_SETFILE_STRICT env var to make an unreachable data file fatal rather
than a warning.
Added tests for this