[mysql] added mysql-connector as a dep for all tests

Author: ufoot

tox.ini

@@ -43,6 +43,7 @@ deps =
     flaskcache013: flask_cache>=0.13,<0.14
     mongoengine
     psycopg2
+    all: mysql-connector
     mysql-connector12: mysql-connector>=1.2,<2.0
     mysql-connector20: mysql-connector>=2.0,<2.1
     mysql-connector21: mysql-connector>=2.1,<2.2