Implement zoneverify_log_error() and zoneverify_print()
These functions will be used in the process of replacing fatal(), check_result(), and fprintf() calls throughout lib/dns/zoneverify.c with code that does not call exit(). They are intended for: - zoneverify_log_error(): logging problems encountered while performing zone verification, - zoneverify_print(): printing status messages and reports which are only useful in standalone tools. To make using dns_zone_logv() possible, add a new "zone" argument to dns_zoneverify_dnssec() that standalone tools are expected to set to NULL.
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