Add --remote on index.sh for activate Historial in the svn repository

fixes #2856

Author: ehurtado

docker/index.sh

@@ -23,6 +23,7 @@ opengrok-indexer \
     -a /opengrok/lib/opengrok.jar -- \
     -s /opengrok/src \
     -d /opengrok/data \
+    --remote on \
     --leadingWildCards on \
     -W /opengrok/etc/configuration.xml \
     -U "$URI" \