add some negative tests for force_delete/restore

- test_force_delete_nonexistent_server_id
- test_force_delete_server_invalid_state
- test_restore_nonexistent_server_id
- test_restore_server_invalid_state

negative tests should stay in negative files of corresponding action.

Change-Id: Icafcb1e17382f8856937e8e903650fb424b00a25
Merge "add some negative tests for force_delete/restore"