[merge][#109520] gc of LockableFiles should not warn or unlock

[Aaron Bentley]

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Martin Pool wrote:
> For example they're
> test cases for breaking a lock, where we unavoidably end up with an
> object left behind that thinks it's still locked, but that can never
> be unlocked.

We *can* avoid it in cases like that.

See my "[MERGE] Fix test kipple in test_break_lock_breaks_physical_lock"
fix from last week, for example.

You just call control_files.leave_in_place, then unlock.  This leaves
the lock files in place, so you can test breaking the lock.

Aaron
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