parse nginx log_format

[Canop]

Right now rhit assumes the log format is the default one, which is quite common.

Among the reasons I had not to interpret the configured log format:

• it's painful to write an efficient enough variable parser
• changing the configuration means the past isn't readable anymore, so it can't be perfect
• the log_format variable lets you define unparsable and ambiguous log lines
• you may define formats missing essential fields

So, as long as it looks like I can have something working for 99% of users, using a few tricks and dynamic recognitions, I won't implement this issue.

Nevertheless, I'm not sure not parsing the log_format will always be OK, hence this issue.

[im-n1]

Okay, fits to my case.