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348582c4c8
Some tests mark clusters as 'dirty', which makes them non-reusable by later tests; we don't want to return them to the pool of clusters. This use-case was covered by the `add_one` function in the `Pool` class. However, it had the unintended side effect of creating extra clusters even if there were no more tests that were waiting for new clusters. Rewrite the implementation of `Pool` so it provides 3 interface functions: - `get` borrows an object, building it first if necessary - `put` returns a borrowed object - `steal` is called by a borrower to free up space in the pool; the borrower is then responsible for cleaning up the object. Both `put` and `steal` wake up any outstanding `get` calls. Objects are built only in `get`, so no objects are built if none are needed. Closes #11558