[JENKINS-53282] "Restarting VM as requested" should be just an INFO message (#3603)
[JENKINS-53282] "Restarting VM as requested" should be just an INFO message (#3603)

* [JENKINS-53282] "Restarting VM as requested" should be just an INFO message

Previously logged as severe was I think incorrect, as it was simply
reacting on "standard" user interaction.
`INFO` ought to be enough because anyway, that's the default logged level,
hence will still be seen by admins if needed.

Side note: there's clearly duplications of code here.
I might address it later, but do not want to right now transform a 5 min
task into a much riskier one.

* Also lower log severity when shutting down after user request

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