Allow to rsync Centos Software Collections repo

Remove Centos sclo from exclude list.

Change-Id: I8aae878d4dbb40b537913c66912320a91a4ac99b
Needed-By: https://review.opendev.org/#/c/671178/

playbooks/roles/mirror-update/files/centos-mirror-update

@@ -61,7 +61,6 @@ for REPO in $REPOS; do
     --exclude="fasttrack" \
     --exclude="isos" \
     --exclude="paas" \
-    --exclude="sclo" \
     --exclude="*/drpms" \
     $EXTRA_OPTS \
     $MIRROR_PATH $BASE/$REPO/