Remove unit types commits and settings (#2161)

* Remove unit types commits and settings

* Can not limit units in administrator teams

* Limit changing units only to teams with read and write access mode

* Small code optimization

models/fixtures/access.yml

@@ -9,3 +9,9 @@
   user_id: 4
   repo_id: 4
   mode: 2 # write
+
+-
+  id: 3
+  user_id: 4
+  repo_id: 3
+  mode: 2 # write