This patch adds a new type of collector "sqlalchemy".
To enable it, add the following line into DevStack local.conf:
OSPROFILER_COLLECTOR=sqlalchemy
OSProfiler DevStack plugin creates database for traces and
configures all services to use it.
SQLAlchemy driver is extend to be able to list traces.
Zuul job is added to run Tempest tests with sqlalchemy driver enabled.
Change-Id: Ia943d311d78f6dfd2e6bb884c8dca725b3b2a36b
0fcc65d0d5