Increase default for CHANGE_REQUEST_FROM_SOT
Increase default for CHANGE_REQUEST_FROM_SOT

Sometimes there is a sequence of internal only changes that are
not exported. This reduces the chances of not finding the change
in this case. The performance impact should be minimal (And we
can optimize if needed).

Change-Id: I190bb34348735fd91b5d5773a4643c601138c496

google/copybara,google/copybara,google/copybara