Allow to download reposize.sh script from Gerrit

Change-Id: Ic8d81a64a89fe0046fccc13e7892acbe52c55bc4
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

Documentation/intro-project-owner.txt

@@ -688,9 +688,16 @@ stays intact; signed tags will lose their signature):
 If a link:config-gerrit.html#receive.maxObjectSizeLimit[max object size
 limit] is configured on the server you may need to remove large objects
 from the history before you are able to push. To find large objects in
-the history of your project you can use the
-link:https://gerrit.googlesource.com/gerrit/+/master/contrib/reposize.sh[
-reposize.sh] script from Gerrit's `contrib` folder. You can then use the
+the history of your project you can use the `reposize.sh` script which
+you can download from Gerrit:
+
+  $ curl -Lo reposize.sh http://review.example.com:8080/tools/scripts/reposize.sh
+
+or
+
+  $ scp -p -P 29418 john.doe@review.example.com:scripts/reposize.sh .
+
+You can then use the
 link:https://www.kernel.org/pub/software/scm/git/docs/git-filter-branch.html[
 git filter-branch] command to remove the large objects from the history
 of all branches:

gerrit-server/src/main/resources/com/google/gerrit/server/tools/root/TOC

@@ -4,3 +4,5 @@
 755 bin/gerrit-cherry-pick
 
 755 hooks/commit-msg
+
+755 scripts/reposize.sh