Add Fedora Atomic mirrors

The Magnum projects needs Fedora Atomic images in order to be able
to run tests.  This patch adds Fedora Atomic images to be mirrored,
excluding any other extra items which are unnecessary.

Change-Id: I9f730b907f920cd3be16cdb662685a673044caa1

modules/openstack_project/files/mirror/fedora-mirror-update.sh

@@ -59,6 +59,21 @@ for REPO in updates/25 updates/26 ; do
         $MIRROR/fedora/$REPO/ $BASE/$REPO/
 done
 
+if ! [ -f $BASE/atomic ]; then
+    $K5START mkdir -p $BASE/atomic
+fi
+
+echo "Running rsync atomic..."
+date --iso-8601=ns
+$K5START rsync -rlptDvz \
+    --delete \
+    --delete-excluded \
+    --exclude="testing/" \
+    --exclude="Atomic/" \
+    --exclude="CloudImages/x86_64/images/*.raw.xz" \
+    --exclude="CloudImages/x86_64/images/*.box" \
+    $MIRROR/fedora-alt/atomic/ $BASE/atomic/
+
 # TODO(pabelanger): Validate rsync process
 
 date --iso-8601=ns | $K5START tee $BASE/timestamp.txt