[integration] tweaks needed to integrate with lnav

[tstack]

Mostly need to make some more fields public so
lnav can read them.

Also, restore checking if the file name mentioned
in the log is in the discovered source path. The
check is pretty loose since I think I've seen
file names truncated before.

[tstack]

I've done enough wiring to where I can add the source path and then do a SELECT on the all_logs virtual SQLite table:

lnav -c ':add-source-path ../lnav/src' -c ';SELECT log_line,log_msg_format,log_msg_values,log_msg_src FROM all_logs LIMIT 10'

The result looks about right:

Seeing the variable names in there is pretty neat! Nice work!

(The green bar is because of the line number, need to see about turning that off...)

[ttiimm]

Nice to see it working end to end!