Count retries and redispatches

Hello,

It is important to know how does your instalation perform. Haproxy masks connection errors, which is extremely good for a client but it is bad for an administrator (except people believing that "ignorance is a bless").

Attached patch adds retries and redispatches counters, so now haproxy:

1. For server:
   • counts retried connections (masked or not)
2. For backends:
   • counts retried connections (masked or not) that happened to a slave server
   • counts redispatched connections
   • does not count successfully redispatched connections as backend errors. Errors are increased only when client does not get a valid response, in other words: with failed redispatch or when this function is not enabled.
3. For statistics:
   • display Retr (retries) and Redis (redispatches) as a "Warning" information.

I think it is a post-1.3.12 material.

Best regards,

                                 Krzysztof Olêdzki