Update packaging as of Ubuntu devel packaging

[utkarsh2102]

Hello,

This PR is an initiative to align the Debian packaging of guest-oslogin in Ubuntu and upstream (here).

The diff represents the changes we have in Ubuntu. I'm forwarding them here as they're all relevant and follow the standard Debian packaging practices. These changes are what we have in Ubuntu devel (current development branch).

These changes change how packaging is done and don't affect the resulting binaries (that is, there is no functional change).

Please let me know if you have any questions or concerns.

[google-oss-prow]

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[google-oss-prow]

Hi @utkarsh2102. Thanks for your PR.

I'm waiting for a GoogleCloudPlatform member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[utkarsh2102]

@dorileo @a-crate, hey, this is ready for your review! :)

[a-crate]

LGTM. @dorileo ?

[dorileo]

/lgtm

[dorileo]

/ok-to-test