Merge pull request #265 from aio-libs/fixt-mysql

Fix mysql backend tests

Author: jettify

tests/db_fixtures.py

@@ -14,7 +14,7 @@
 
 
 def pytest_namespace():
-    dbs = 'pg', 'mongo'
+    dbs = 'pg', 'mongo', 'mysql'
     return {'admin_type_list': dbs}
 
 

tests/docker_fixtures.py

@@ -144,7 +144,7 @@ def mysql_params(mysql_server):
 
 @pytest.fixture(scope='session')
 def mysql_server(host, unused_port, container_starter):
-    tag = '8.0'
+    tag = '5.7'
     image = 'mysql:{}'.format(tag)
 
     internal_port = 3306