request #7590: Allow SVN immutable tags

The svn repository should be:
-product1
	--trunk
	--tags
	--branch
-product2
	--trunk
	--tags
	--branch
...
-productn
	--trunk
	--tags
	--branch"

Change-Id: I7cc67f0637d52eecdb77ac02fbc5fba8dd173acd
Merge commit 'refs/changes/81/3181/8' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7590: Allow SVN immutable tags

Change-Id: I2acfeb9fe93284b3586962a4ee31a3e60b31d1fe
This is Tuleap 7.7.99.17

Change-Id: I3664800cd0868c930cd7b5295270d3d14d6fdcc9