Add testRollbackNoTransaction for MaxDB

"Make rollback() and commit() no ops when no transaction is active"
was merged on stable-1.7 which does not have support for MaxDB, and
thus the test for MaxDB was omitted.

This commit adds the necessary test.

Change-Id: I6633c490d4cbdaca5d0d400b1cd3fddb7bb45bad
1 file changed