Expect an increase in timeout failures after 8260555 is integrated

[Leo Korinth]

Hi, I am going to integrate "8260555: Change the default
TIMEOUT_FACTOR from 4 to 1". I have put a *lot* of effort in testing
this, but there will for sure be more test timeouts after this
integration.

I write this message so that everyone can understand why test cases
will be more likely to time out. The reason is that the default
timeout factor will be changed from 4 to 1, and thus the timeout of
(most) test cases will be one fourth as long. I foresee that the most
common timeout case will be a default implicit timeout of 120 seconds
that will timeout. The easy solution to this is adding a timeout of
480 that will revert to the old timeout value of 4 * 120.

I have changed 342 files, and done many re-runs, but there is no
good way to catch them all.

-- 
Leo