Do not call exit() upon verify_nodes() errors
Replace all fatal(), check_result(), and check_dns_dbiterator_current() calls inside verify_nodes() with zoneverify_log_error() calls and error handling code. Enable verify_nodes() to signal errors to the caller using its return value. Modify the call site of verify_nodes() so that its errors are properly handled. Free all heap elements upon verification context cleanup as a verification error may prevent them from being freed elsewhere. Remove the check_dns_dbiterator_current() macro as it is no longer used anywhere in lib/dns/zoneverify.c.
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