Packaging fixes.

[ximon18]

This PR:

• Uses a not-yet-released version of Ploutos that contains the following
  changes:

  • Correctly handle SystemD service units whose name is not the same as the
    package name (in our case 'cascaded' is not the same as 'cascade').
  • Always create the package manager repository configurations defined by the
    'deb_apt_source' and 'rpm_yum_repo' settings, not only when doing upgrade
    testing, as we have dependencies on packages (dnst and kmip2pkcs11) which
    are not available via the default O/S repositories but are only published
    in the proposed channel of the packages.nlnetlabs.nl repository, and so
    that repository needs to be configured before attempting to install cascade.

• Fixes incorrect names in various places, e.g. cascade instead of cascaded, and
  cascade.conf instead of config.toml.

• Reformats the DEB assets in cargo.toml to be more readable.

• Fixes issues reported by rpmlint about the RPM package description.

• Corrects and slightly improves the post-install package test script.

For a successful packaging run see: https://github.com/NLnetLabs/cascade/actions/runs/17458887099

[mozzieongit]

Was just thinking about this fix.

Can you also fix the service name in:

• https://github.com/NLnetLabs/cascade/blob/workaround-rpm-packaging-failure/pkg/rpm/scriptlets.toml#L21-L44
• https://github.com/NLnetLabs/cascade/blob/workaround-rpm-packaging-failure/pkg/rules/packages-to-build.yml#L21
• https://github.com/NLnetLabs/cascade/blob/workaround-rpm-packaging-failure/pkg/test-scripts/test-cascade.sh#L16-L30
• https://github.com/NLnetLabs/cascade/blob/workaround-rpm-packaging-failure/pkg/common/cascaded.cascaded.service#L7

(Damn, I forgot quite a few renames ^^)