Comment 17 for bug 1893716

Summarizing the low hanging fruits here:
- Add caching to 50-landscape-sysinfo
- Add caching to 95-hwe-eol
- /usr/lib/update-notifier/update-motd-hwe-eol calls apt-config multiple times.
  consider reducing those calls
- 91-release-upgrade unconditionally calls lsb_release which is expensive.
  Use the same check others use

The rest already uses caching AND/OR is small, fast and simple.

The follow on of making pam_motd truly not do anything on non-interactive can then be a follow on case and would no more be that important.

For these fixes three packages need to be touched:
Source: ubuntu-release-upgrader
Source: update-notifier
Source: landscape-client