Fix problem found when running unittests under Python 2.6: datetime.time.isoformat() doesn't take a 'sep' argument like datetime.datetime.isoformat() does.
Fix problem found when running unittests under Python 2.6: datetime.time.isoformat()
doesn't take a 'sep' argument like datetime.datetime.isoformat() does.

d33tah/bpgsql,olopez32/py-bpgsql,barryp/py-bpgsql