story #7395: site admin can re-index a tracker (like docman or wiki)

Change-Id: I39cb1991c79e2a5bd12768d0ec3cf7b3a486a44e
Merge commit 'refs/changes/57/3157/10' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7395: site admin can re-index a tracker (like docman or wiki)

Change-Id: I2f326f3bd89fd25c82d9634d9190dd765db93826
This is Tuleap 7.6.99.21

Change-Id: Ibf4518d0f2213522e72bebeb56dd4e2f268bdeba