Allow running of sql against the live DB.

Reordered the tables in the domain downgrade script to avoid breaking the integrity constraints

To run the test:
./run_tests.sh -N  test_sql_upgrade

This version removed all of the code specific to running against a live DB and merged it into the
standard tests.

Fixed a couple downgrade functions that were failing.  They had not
been tested

Change-Id: Ie1214e5543bd08fde95652af2464cc9c80db449d

tests/backend_sql.conf

@@ -1,5 +1,9 @@
 [sql]
 connection = sqlite://
+#To Test MySQL:
+#connection = mysql://root:keystone@localhost/keystone?charset=utf8
+#To Test PostgreSQL:
+#connection = postgresql://keystone:keystone@localhost/keystone?client_encoding=utf8
 idle_timeout = 200
 
 [identity]

tests/test_sql_upgrade.py

@@ -13,7 +13,18 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
-
+"""
+To run these tests against a live database:
+1. Modify the file `tests/backend_sql.conf` to use the connection for your
+   live database
+2. Set up a blank, live database.
+3. run the tests using
+    ./run_tests.sh -N  test_sql_upgrade
+    WARNING::
+        Your database will be wiped.
+    Do not do this against a Database with valuable data as
+    all data will be lost.
+"""
 import copy
 import json
 import uuid
@@ -54,6 +65,10 @@ def setUp(self):
                                                              self.repo_path, 0)
 
     def tearDown(self):
+        table = sqlalchemy.Table("migrate_version", self.metadata,
+                                 autoload=True)
+        self.downgrade(0)
+        table.drop(self.engine, checkfirst=True)
         super(SqlUpgradeTests, self).tearDown()
 
     def test_blank_db_to_start(self):