syslogd: allow network and local messages to use different formats

[wollman]

Summary

I need to be able to submit logs to a log server in RFC5424 format, but I don't want to change the format of local log files. I added a -r option that controls only the format of network destinations. I've given up my commit bit, so if this is accepted I'll be trying to recruit a src committer to push this.

Test Plan

We're running this in production now, sending to a graylog server, and once my colleagues who manage that service fix it so I can access it again, I'll be making sure that the messages are getting received an parsed properly.

[bcr]

OK from manpages.

[wollman]

I rewrote this to use an enum for the format type rather than a boolean, making it more flexible in the future. Will re-upload some day.

[wollman]

Restructured to use an enum for output formats rather than a bool, making it easier to change the defaults or add additional formats in the future. This was rebased onto 13.2 as a part of our migration; I haven't checked whether it still applies to 14-current.

[wollman]

In our repo this is two separate commits, one for adding the enum and a second for the -r option. Anyone who wants to commit this, I'd be happy to provide git format-patch format.

[pauamma_gundo.com]

Manual page English LGTM.