Add collaborative repositories to the dashboard (#2205)

* Add collaborative repositories to the dashboard

Remove some unused code from the Dashboard func

* fix some bug and some refactor

* fix tests

models/repo_list_test.go

@@ -42,6 +42,7 @@ func TestSearchRepositoryByName(t *testing.T) {
 		Keyword:  "repo_13",
 		Page:     1,
 		PageSize: 10,
+		Private:  true,
 		Searcher: &User{ID: 14},
 	})
 
@@ -54,6 +55,7 @@ func TestSearchRepositoryByName(t *testing.T) {
 		Keyword:  "test_repo",
 		Page:     1,
 		PageSize: 10,
+		Private:  true,
 		Searcher: &User{ID: 14},
 	})