fix tarvis
tests
-v
if operationerror,reconnect mysql
fix return of connect
operation error:ping.test code:teardown with close conn
table type turn to :innodb
modified table.sql
engine=innodb
autocommit
no close
set autocommit=1
commit before drop tables
add transaction
add commit to virgo
auto commit
autocommit for each new connection
remove begin and commit from tests