test: remove `sleep` usage in `test-nointerrupt.t` (
issue6271)
We move from sleep based synchronisation to file creation based synchronisation.
Sleeps is the path to the dark side.
Sleeps leads to flakiness.
Flakiness leads to anger.
Anger leads to hate.
Hate leads to suffering.
Differential Revision: https://phab.mercurial-scm.org/D11205
Added signature for changeset
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Added tag 5.9rc0 for changeset
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