Fix dc-tool call. in a day or two fix it again by redirecting its spam to dev/null

Signed-off-by: NJoerg Jaspert <joerg@debian.org>

config/debian/cron.daily

@@ -47,7 +47,10 @@ dak override-disparity | gzip -9 > ${webdir}/override-disparity.gz
 dak stats new ${webdir}/NEW-stats.yaml 2> /dev/null
 
 # Generate the contributor data
-dc-tool --mine="${configdir}/contributor.source" --auth-token @"${base}/s3kr1t/contributor.auth" --post
+# FIXME: In a day or three, when this worked from cron without
+# failure, redirect its output to dev/null. Alternatively until then
+# enrico added a --quiet and we use that.
+dc-tool --mine="${configdir}/contributor.source" --auth-token @"${base}/s3kr1t/contributor.auth" --source ftp.debian.org --post
 
 ${scriptsdir}/link_morgue.sh