keep only 200 logs per app in redis
keep only 200 logs per app in redis

(the original 1500 wasn't chosen for any valid reason)

to mitigate memory usage due to app growth until we come up with a
proper location for app logs.

also changed the doc,
https://docs.google.com/a/activestate.com/document/d/1igurWUgBDHNjkXuMMoVFoqD7xdcF03Rv6inpN-PICws/edit

ActiveState/logyard,hpcloud/logyard