Add two tests for resize action in ServerActionsControllerTest.

Add test_resize_not_found for NotFound;
and test_resize_with_too_many_instances for TooManyInstances.

Fix bug #1089417

Change-Id: I18dda1129e1bb3d411bb8a5dab9474d67fcb18fd
Merge "Add two tests for resize action in ServerActionsControllerTest."