Debian package: fix of fail of adduser/addgroup commands if the user already exists.

Signed-off-by: Vasiliy Kiryanov <vasiliy.kiryanov@gmail.com>
Fix a TypeError: 'tuple' object does not support item assignment
Redis: add per database metrics

Signed-off-by: Vasiliy Kiryanov <vasiliy.kiryanov@gmail.com>
elasticsearch.py: correct misspelled variable name.

Signed-off-by: Vasiliy Kiryanov <vasiliy.kiryanov@gmail.com>