a-v6r11 [v6r11]

I made 2 scripts:
- dirac-rss-db.py (based on ResourceStatusClient): to query (select, insert, update, delete, add, modify) the ResourceStatusDB tables but I have tested it only for ServiceStatus and ServiceLog
- dirac-rms-downTime.py (based on ResourceManagemenetClient): to query (select, add, delete) the DownTimeCache table in the ResourceManagementDB