More improvements to SQL Lab (#1104)

* Handling timeouts

* Fixing timer on non-utc server

* Allowing async with results

* [bugfix] database is not selected

* Making sure the session is up and running

* Cleaning up query results and query objects

* Picking a groupby and metric field on visualize flow

* Showing local time in query history

* Using pull-left pull-right instead of grid layout for table metdata

Long column name were looking weird and icons were wrapping oddly

* Linting

* Eliminating east buttons under the sql editor

* Sort database dropdown by name

* Linting

* Allowing non-SELECT statements to run

* Adding a db config

* Making sqla checkout check cross-db

tests/celery_tests.py

@@ -226,7 +226,8 @@ class CeleryTestCase(CaravelTestCase):
         sql_where = "SELECT name FROM ab_role WHERE name='Admin'"
         result1 = self.run_sql(
             1, sql_where, async='true', tmp_table='tmp_async_1', cta='true')
-        self.assertEqual(QueryStatus.PENDING, result1['query']['state'])
+        assert result1['query']['state'] in (
+            QueryStatus.PENDING, QueryStatus.RUNNING, QueryStatus.SUCCESS)
 
         time.sleep(1)