No progress indication when the training is performed

[carlosms]

When the analyzer is busy doing the initial training the logs do not show anything.
Since this process can take hours, it would be nice to get some kind of progress indication in the logs; or maybe a periodic log message to indicate that the training is still in progress.

Otherwise it looks like something failed and it is stuck.

[vmarkovtsev]

@carlosms we've got an awesome progress indication at the debug log level. I have also improved them at the info level. Could you please check both info and debug, if the first is still too brief you can switch to the second.