Mark bunch of pub tests as flaky.

sdk/lib/_internal/pub/pub.status

Index: sdk/lib/_internal/pub/pub.status
diff --git a/sdk/lib/_internal/pub/pub.status b/sdk/lib/_internal/pub/pub.status
index 0416cf1e73f2b44079f8d5ca24bd474fc8e8d665..276a0d5ec31f097e634dc67e760fbc772021df21 100644
--- a/sdk/lib/_internal/pub/pub.status
+++ b/sdk/lib/_internal/pub/pub.status
@@ -2,16 +2,20 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-test/serve/missing_file_test: Pass, Fail # 12570
-test/oauth2/with_an_expired_credentials_refreshes_and_saves_test: Pass, Fail # 12581
-test/hosted/remove_removed_dependency_test: Pass, Fail # 12582
-test/hosted/remove_removed_transitive_dependency_test: Pass, Fail # 12582
-test/install/hosted/cached_pubspec_test: Pass, Fail # 12678
-test/install/hosted/do_not_update_on_removed_constraints_test: Pass, Fail # 12680
-test/install/hosted/install_test: Pass, Fail # 12682
-test/install/hosted/install_transitive_test: Pass, Fail # 12683
-test/install/hosted/repair_cache_test: Pass, Fail # 12684
-test/serve/serve_from_dependency_asset_test: Pass, Fail # 12686
+test/serve/missing_file_test: Pass, Fail # Issue 12570
+test/oauth2/with_an_expired_credentials_refreshes_and_saves_test: Pass, Fail # Issue 12581
+test/hosted/remove_removed_dependency_test: Pass, Fail # Issue 12582
+test/hosted/remove_removed_transitive_dependency_test: Pass, Fail # Issue 12582
+test/install/hosted/cached_pubspec_test: Pass, Fail # Issue 12678
+test/install/hosted/do_not_update_on_removed_constraints_test: Pass, Fail # Issue 12680
+test/install/hosted/install_test: Pass, Fail # Issue 12682
+test/install/hosted/install_transitive_test: Pass, Fail # Issue 12683
+test/install/hosted/repair_cache_test: Pass, Fail # Issue 12684
+test/serve/serve_from_dependency_asset_test: Pass, Fail # Issue 12686
+test/install/hosted/stay_locked_if_new_is_satisfied_test: Pass, Fail # Issue 12837
+test/install/hosted/unlock_if_incompatible_test: Pass, Fail # Issue 12837
+test/install/hosted/unlock_if_new_is_unsatisfied_test: Pass, Fail # Issue 12837
+test/install/hosted/stay_locked_test: Pass, Fail # Issue 12837
 
 # Pub only runs on the VM, so just rule out all compilers.
 [ $compiler == dart2js || $compiler == dart2dart ]