tasks #6831 - disable tracker for tracker admins during migration

Change-Id: I69eb69448d87d1f93449f0a092485190ac644c3a
Merge commit 'refs/changes/90/2490/5' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6831 - disable tracker for tracker admins during migration

Change-Id: I3036e7bef49680363305d715ea36446bd8d75796
This is Tuleap 7.0.99.46

Change-Id: Ic7d172c269bf639399f3f2fc24e5fb708a213ea7