init: Adding more logs inside the upload log

When uploading the log file, it's pretty handy to get much more about
the context of the host we deploy. Like if the configure is failing but
the host is unreachable, getting the /configure or the dmesg could help
to understand the problem.

So we add both /configure and dmesg when uploading the log file.
init: gzipping uploaded log

To avoid using too much disk space when uploading a log, let's gzip it
before the sending.
init: Let's upload load if rebooting or getting console

If the upload_log is enabled, it's good to upload the log file in all
case. That could helpful for later analysis.