Port SQLAlchemy reporter to v3 driver structure

This completes the merge from master and re-enables the sqlalchemy
driver tests.

Change-Id: I8e6effb3f0052343d5c6c80e9edaa2a9ff360b4d

tests/fixtures/zuul-sql-driver-bad.conf

@@ -0,0 +1,30 @@
+[gearman]
+server=127.0.0.1
+
+[zuul]
+tenant_config=main.yaml
+url_pattern=http://logs.example.com/{change.number}/{change.patchset}/{pipeline.name}/{job.name}/{build.number}
+job_name_in_report=true
+
+[merger]
+git_dir=/tmp/zuul-test/merger-git
+git_user_email=zuul@example.com
+git_user_name=zuul
+zuul_url=http://zuul.example.com/p
+
+[executor]
+git_dir=/tmp/zuul-test/executor-git
+
+[connection gerrit]
+driver=gerrit
+server=review.example.com
+user=jenkins
+sshkey=fake_id_rsa1
+
+[connection resultsdb]
+driver=sql
+dburi=mysql+pymysql://bad:creds@host/db
+
+[connection resultsdb_failures]
+driver=sql
+dburi=mysql+pymysql://bad:creds@host/db