test: fix flaky unrefed timers test
Fixes: https://github.com/nodejs/node/issues/4559
A hopefully easier-to-LGTM fix than (my personally preferred) #4561.
R=@Fishrock123
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes: https://github.com/nodejs/node/issues/4559
A hopefully easier-to-LGTM fix than (my personally preferred) #4561.
R=@Fishrock123