fix TestPoolBackgroundChecksMinConns and NewConnsCount #1693
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Previously it was checking TotalConns but that includes ConstructingConns. Instead it should directly check IdleConns so the next Acquire takes one of those and doesn't make a 3rd connection. The check against the context was also wrong which prevented this from timing out after 2 minutes.
This also fixes a bug where NewConnsCount was not correctly counting connections created by Acquire directly.
Fixes #1690