Updated openstack/openstack
Project: openstack/oslo.db  0ebc514f98cdb6da485f0f894becfc9aeac716d4

Add eventlet.tpool.Proxy for DB API calls

Ability to use thread pooling for DB API calls should be returned in
oslo.db as DB API wrapper.

Base on the fact that this wrapper is optional, `eventlet` should
not be added in requirements.

bp add-tpool-proxy-wrapper

Change-Id: I2343556c157e9f0f695e14ca0283914ef23c972c