Improve logging, use log.group in ProductControl (bsc#1204625)

[lslezak]

Problem

• The installation log is hardly readable, it is difficult to navigate, it is not clear where each installation step starts and finishes
• Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1204625
• Related PR: Added "log.group" method, allow installation via "yupdate" yast-ruby-bindings#287

Review Notes

• Use the "Hide whitespace" diff option otherwise the diff is too long and harder to read.
• Simply use this link

Solution

• Use the new log.group call and group the logs for each executed step

Testing

• Tested manually
• See the example log from TW installation how it works (click the "Load URL" button to load the example log then scroll to the bottom)

[coveralls]

Coverage increased (+0.03%) to 41.719% when pulling 3f612ed on logging into 13d6af4 on master.

[mvidner]

LGTM

but the bad news is, now I have seen that RunFrom is a 300 line method 🤯

[yast-bot]

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