Austin Clark d132b0e6c9 Update API docs to include alternative db layer initialization
Adds another usage method in 'Example usage patterns' that shows
how to initialize a db layer client without oslo.config. This is done
by creating a sqlalchemy engine with the appropriate db address and
then creating a session that will be directly passed to api methods.

Change-Id: Id01bb528b5357bcc4758c9fa7859778db527e0d3
2015-08-07 09:33:37 -06:00
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