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testlib: adjust wait-on-file timeout according to the global test timeout

Authored by marmoute.

Description

testlib: adjust wait-on-file timeout according to the global test timeout

Lets assume that if test timeout have been set to be twice as long, it means
local timeout should be twice as long too.

I am not aware of any case were extending timeout for file based synchronisation
was necessary, but the safety seems simple to implements.

Differential Revision: https://phab.mercurial-scm.org/D8316