adding new version of SQLAlchemy

Updated sqlalchemy from 0.5.2 to 0.9.6 version.

Before using this change, the patch to WMCore must be installed: https://github.com/dmwm/WMCore/pull/5286

It was tested only in SLC6 and pushed to comp_gcc481 branch.


@amaltaro @juztas @hufnagel