Fix missing dsn sanitization for logging (#1104)

This log line was not sanitized previously which could result in logging sensitive information. I have scanned the rest of the files and I don't see anywhere else that DSN is used in a log line without this filter.

Resolves #1042

Signed-off-by: Joe Adams <github@joeadams.io>

Author: sysadmind

cmd/postgres_exporter/postgres_exporter.go

@@ -681,7 +681,7 @@ func (e *Exporter) scrape(ch chan<- prometheus.Metric) {
 		if err := e.scrapeDSN(ch, dsn); err != nil {
 			errorsCount++
 
-			logger.Error("error scraping dsn", "err", err, "dsn", dsn)
+			logger.Error("error scraping dsn", "err", err, "dsn", loggableDSN(dsn))
 
 			if _, ok := err.(*ErrorConnectToServer); ok {
 				connectionErrorsCount++