When migrating a project to gerrit, now Umbrella project inherits parent
Umbrella if any.

Change-Id: Ie2340db12eef186f55347807dde4ed74e07b19e5
Merge remote-tracking branch 'gerrit/3633_gerrit_project_inherit_from_parents' into tuleap-stable-master

* gerrit/3633_gerrit_project_inherit_from_parents:
  When migrating a project to gerrit, now Umbrella project inherits parent Umbrella if any.

Change-Id: Id224ea840d7cff671ee0da8eca1e4edc7990666d
Tuleap 6.1.99.20

Change-Id: I13f167e3ed54f9a243ca3a1c1bfbf214cd62101c