Updated openstack/openstack
Project: openstack/ceilometer  ac26db7cfa42f751be63a406056f4ed3e828f56d

refactor sql backend to improve write speed

- drop sourceassoc table as its data is not accessible via api
- drop resource table since data can be retreive from sample table

Change-Id: I2d4a5175734cafce6a439ad736c47691e6e7e847
Implements: blueprint big-data-sql
Closes-Bug: #1305332
Closes-Bug: #1257908