Bump up the sqlalchemy version for py26

The redhat repo for RDO and epel itself has access to 0.8 so
it would be great if we also tested those same versions since
those versions are common on that distribution (the main one
that still runs py26).

Change-Id: I25fe6a345bf417fc6957f075ac01f361bcd36982
Merge "Bump up the sqlalchemy version for py26"