chore: Update systemd description

[holmanb]

Proposed Commit Message

chore: Update systemd description

The current descriptions do not follow systemd guidance and are misleading since some services have multiple roles.

systemd.unit(5) on Description:

    A short human readable title of the unit. This may be used by systemd
    (and other UIs) as a user-visible label for the unit, so this string
    should identify the unit rather than describe it, despite the name.

Yet these service files attempt to describe the unit rather than identify it.

Before:
May 01 09:49:49.238629 tiny systemd[1]: Starting cloud-config.service - Apply the settings specified in cloud-config...


After:
May 01 09:49:49.238629 tiny systemd[1]: Starting cloud-config.service - Cloud-init: Config Stage...

Additional Context

There's also the fact that the service files allude to the hotplug command being a daemon when it actually isn't, but that's for a different PR.

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)

[blackboxsw]

Other than a nit for a slightly more details suffix for init-local +1