Fixes and Log Improvement

• account-server: only log exception when using DEBUG log level
• tools: Zookeeper scripts adapted to the latest python modules.
• server / gridd : accesslog now extracts the CID from sqlx base names. Useful for log agregation on replicated environments.
• server: clearer message in access log upon a redirect …
• proxy: added missing sanity checks. With the v3.0 routes, URL tokens are not systematically checked. This has been fixed in several places for the service type.
• proxy: fixed response status upon code=400 from the backend
• proxy: fixed minor a one-shot memleak
• proxy: when listing, fixed 'max' parsing and output's order.
• meta2v2: fixes event sending upon a container's destruction
• meta2v2: fixed number of aliases output when listing