tasks #7306: Project admin can choose its Mediawiki (embedded or not)

Change-Id: Ia27b8ff62a15e425615541c4eda371cb7030b1d6
Merge commit 'refs/changes/49/2849/4' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7306: Project admin can choose its Mediawiki (embedded or not)

Change-Id: Iede10d3f1ed570b8b6b65bbb0cf8737d446500ae
This is Tuleap 7.3.99.36

Change-Id: I66d7255a45cb1a12e885e8b30a91ab1567995aec