Truncate motd file on upgrade

[atsikham]

Task #2494

[przemyslavic]

/azp run

[przemyslavic]

Tested apply and upgrade on Ubuntu, RHEL and CentOS.
On a cluster upgraded from v1.1.0 to dev it shows Epiphany version is 1.1.0, is that correct? I assume it is because this is an upgrade, and not re-apply, but I want to make sure 😉

[atsikham]

@przemyslavic I think it should be discussed as I also don't know requirements, but I would change that during upgrade 😄

[przemyslavic]

@atsikham After discussion, we agreed that it would be good to have information about the original version that was installed and the version to which it was updated.

[atsikham]

@atsikham After discussion, we agreed that it would be good to have information about the original version that was installed and the version to which it was updated.

It was discussed internally that what's is displayed there needs to be discussed after #1306 (PR #2650) is completed.