Fix http://dev.1flow.net/1flow/1flow/group/56146/ logging string.
Fix http://dev.1flow.net/1flow/1flow/group/56146/ logging string.

Noticed during the GitHub DDoS attack :

https://github.com/blog/1981-large-scale-ddos-attack-on-github-com

1flow/python-ftr,1flow/python-ftr