Add search mode option to /api/repo/search (#2756)

* Add repo type option to /api/repo/search

* Add tests and fix result of collaborative filter in specific condition

* Fix/optimize search & tests

* Improve integration tests

* Fix lint errors

* Fix unit tests

* Change and improve internal implementation of repo search

* Use NonexistentID

* Make search api more general

* Change mirror and fork search behaviour

* Fix tests & typo in comment

models/fixtures/user.yml

@@ -281,4 +281,36 @@
   avatar: avatar18
   avatar_email: user18@example.com
   num_repos: 0
+  is_active: true
+
+-
+  id: 19
+  lower_name: user19
+  name: user19
+  full_name: User 19
+  email: user19@example.com
+  passwd: 7d93daa0d1e6f2305cc8fa496847d61dc7320bb16262f9c55dd753480207234cdd96a93194e408341971742f4701772a025a # password
+  type: 1 # organization
+  salt: ZogKvWdyEx
+  is_admin: false
+  avatar: avatar19
+  avatar_email: user19@example.com
+  num_repos: 2
+  is_active: true
+  num_members: 1
+  num_teams: 1
+
+-
+  id: 20
+  lower_name: user20
+  name: user20
+  full_name: User 20
+  email: user20@example.com
+  passwd: 7d93daa0d1e6f2305cc8fa496847d61dc7320bb16262f9c55dd753480207234cdd96a93194e408341971742f4701772a025a # password
+  type: 0 # individual
+  salt: ZogKvWdyEx
+  is_admin: false
+  avatar: avatar20
+  avatar_email: user20@example.com
+  num_repos: 4
   is_active: true