Remove redundant code from magnum.test.utils

Some codes in magnum.tests.utils is redundant. The Database class
has been defined in magnum.test.unit.db.base. get_dummy_session
and create_models_from_data are not used by other codes. So we
just remove it.

Change-Id: Ib91e1f61f0032221fe4f45237b5ea8cf09d13564
Closes-Bug: 1476458

magnum/tests/utils.py

@@ -12,56 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import tempfile
-
-import fixtures
-from oslo_config import cfg
-from oslo_db import options
-
 from magnum.common import context as magnum_context
-from magnum.db import api as db_api
-from magnum.db.sqlalchemy import api as sql_api
-
-CONF = cfg.CONF
 
 
 def dummy_context(user='test_username', project_id='test_tenant_id'):
     return magnum_context.RequestContext(user=user, project_id=project_id)
-
-
-class Database(fixtures.Fixture):
-
-    def __init__(self):
-        super(Database, self).__init__()
-        self.db_file = None
-        with tempfile.NamedTemporaryFile(suffix='.sqlite',
-                                         delete=False) as test_file:
-            # note the temp file gets deleted by the NestedTempfile fixture.
-            self.db_file = test_file.name
-
-    def setUp(self):
-        super(Database, self).setUp()
-        self.configure()
-        sql_api.get_engine().connect()
-#        sql_api.load()
-#        models.Base.metadata.create_all(db_api.IMPL.get_engine())
-
-    def configure(self):
-        options.cfg.set_defaults(options.database_opts,
-                                 sqlite_synchronous=False)
-        options.set_defaults(cfg.CONF,
-                             connection='sqlite:///%s' % self.db_file,
-                             sqlite_db=self.db_file)
-
-
-def get_dummy_session():
-    return db_api.IMPL.get_session()
-
-
-def create_models_from_data(model_cls, data, ctx):
-    for d in data:
-        mdl = model_cls()
-        for key, value in d.items():
-            setattr(mdl, key, value)
-        mdl.create(ctx)
-        d['id'] = mdl.id