nova/releasenotes/notes/drop-oslo_db-use_tpool-4854...

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---
upgrade:
- |
Experimental support for thread pooling of DB API calls has been removed.
This feature was first introduced in the 2014.2 (Juno) release but has not
graduated to fully-supported status since nor was it being used for any
API DB calls. The ``[oslo_db] use_tpool`` config option used to enable
this feature will now be ignored by nova.