Add rollback in TestSA tearDown()
Add rollback in TestSA tearDown()

Otherwise, if you have problems in the other tests, you end up
with two errors b/c the session is in a bad state when the table
delete SQL is ran.

google-code-export/pymssql,Alwnikrotikz/pymssql,Aloomaio/pymssql,Aloomaio/pymssql,AlanZatarain/pymssql,djhenderson/pymssql,MunDaesik/pymssql,Aloomaio/pymssql,JimDennis/pymssql,djhenderson/pymssql,bladams/pymssql,msabramo/pymssql,MunDaesik/pymssql,MunDaesik/pymssql,klothe/pymssql,zerolugithub/pymssql,klothe/pymssql,ramiro/pymssql,zerolugithub/pymssql,msabramo/pymssql,thegooglecodearchive/pymssql,pymssql/pymssql,AlanZatarain/pymssql,google-code-export/pymssql,AlanZatarain/pymssql,bladams/pymssql,bladams/pymssql,Alwnikrotikz/pymssql,thegooglecodearchive/pymssql,thegooglecodearchive/pymssql,pymssql/pymssql,JimDennis/pymssql,msabramo/pymssql,Alwnikrotikz/pymssql,djhenderson/pymssql,ramiro/pymssql,JimDennis/pymssql,klothe/pymssql,zerolugithub/pymssql,google-code-export/pymssql,ramiro/pymssql