Restrict permission check on repositories and fix some problems (#5314)

* fix units permission problems

* fix some bugs and merge LoadUnits to repoAssignment

* refactor permission struct and add some copyright heads

* remove unused codes

* fix routes units check

* improve permission check

* add unit tests for permission

* fix typo

* fix tests

* fix some routes

* fix api permission check

* improve permission check

* fix some permission check

* fix tests

* fix tests

* improve some permission check

* fix some permission check

* refactor AccessLevel

* fix bug

* fix tests

* fix tests

* fix tests

* fix AccessLevel

* rename CanAccess

* fix tests

* fix comment

* fix bug

* add missing unit for test repos

* fix bug

* rename some functions

* fix routes check

models/fixtures/team.yml

@@ -51,3 +51,30 @@
   authorize: 4 # owner
   num_repos: 2
   num_members: 1
+
+-
+  id: 7
+  org_id: 3
+  lower_name: test_team
+  name: test_team
+  authorize: 2 # write
+  num_repos: 1
+  num_members: 1
+
+-
+  id: 8
+  org_id: 17
+  lower_name: test_team
+  name: test_team
+  authorize: 2 # write
+  num_repos: 1
+  num_members: 1
+
+-
+  id: 9
+  org_id: 17
+  lower_name: review_team
+  name: review_team
+  authorize: 1 # read
+  num_repos: 1
+  num_members: 1