add strict mode when parsing messages, typically enabled for incoming special-use messages like tls/dmarc reports, subjectpass emails

and pass a logger to the message parser, so problems with message parsing get
the cid logged.

tlsrptdb/db_test.go

@@ -88,7 +88,7 @@ func TestReport(t *testing.T) {
 		if err != nil {
 			t.Fatalf("open %q: %s", file, err)
 		}
-		report, err := tlsrpt.ParseMessage(f)
+		report, err := tlsrpt.ParseMessage(xlog, f)
 		f.Close()
 		if err != nil {
 			t.Fatalf("parsing TLSRPT from message %q: %s", file.Name(), err)