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The option was replaced 4 years ago[1] by connection_recycle_time. The
option is not anymore present in sqlalchemy. It's the good time to
remove it.
[1] 6634218415
[2] https://review.opendev.org/c/openstack/oslo.db/+/778441
Change-Id: Id288e09688062b007d57f09aebcd7c447e56f04d