Add tests to ensure all control file fields present in an upstream package index will be present in pulp_deb

[pulpbot]

Author: @quba42 (quba42)

Redmine Issue: 7266, https://pulp.plan.io/issues/7266

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We should have test packages/assertions etc. to ensure that each control file field present in an upstream repo makes it into our published repos.

Should be ensured for both simple and structured publish.

Note that "Description-md5" and "Build-Essential" are pure metadata fields that may be present in (upstream) Package indices but are not present in the package control files.
We are ignoring such fields for now.
Any attempt to support them would be a new feature.

[pulpbot]

From: @quba42 (quba42)
Date: 2020-08-04T07:04:30Z

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Note: This issue essentially adds test coverage for the fixes for https://pulp.plan.io/issues/7190.

It serves as a follow on issue, so these essential fixes can be merged without waiting for test coverage for now.

[pulpbot]

From: @quba42 (quba42)
Date: 2020-08-26T08:41:33Z

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Clarification: This relates to APT publications.

(Verbatim publications must necessarily guarantee this already, so we do not need a test for them).

[pulpbot]

From: pulpbot (pulpbot)
Date: 2020-08-27T14:18:47Z

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PR: #203

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