Stephen Finucane 4df41cb4b3 Revert "Don't use '_TransactionContextManager._async'"
This reverts commit bd7d991309ea2bea5d175cb1f2710519936fd0c2 and bumps
the minimum version of oslo.db to 4.40.0, as that is the first version
of the library to include the renamed attribute.

Change-Id: Ic9e7864be3af7ef362cad5648dfc7bdecd104465
Related-Bug: #1788833
2018-08-28 17:18:51 +01:00
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