Folder structure of the deb repos does not match upstreams
Current Behavior: the pulp_deb plugin seems to creates folders under /dists/ based on the codename from the upstream Release file. For example, when I use the following command:
pulp-admin deb repo create ... --feed http://us.archive.ubuntu.com/ubuntu/ --releases bionic-updates
pulp creates the following folder structure:
"bionic" is the value of "Codename" from http://us.archive.ubuntu.com/ubuntu/dists/bionic-updates/Release
It has been noticed that the same behavior where "Codename" is used as a folder name under /dists is present with other versions of ubuntu (xenial) and debian (stretch).
Expected Behavior: In the upstream (see the link above), the folder name seems to be based on the "Suite" value of the Release file which is different from the codename.
Proposed Approach: Use the upstream directory structure based on the Suite value.
Add the distribution field to the DB models
Within a standard Debian repository structure, the term "distribution"
refers to the unique string given by the path segment between the
"dists/" folder, and some "Release" file (without the trailing slash).
Since each "Release" file in the directory structure is associated with
exactly one unique distribution string, the terms "distribution" and
"release" can be (and often are) used interchangably.
The distribution string is most commonly (but not always) given by
either the "codename" or the "suite". The pulp_deb implementation prior
to this commit, has assumed that the distribution string is always equal
to codename, and has therefore imposed a uniqueness constraint on the
codename for all releases/distributions within a single repository.
Since upstream repository sources make no such assumption and are not
necessarily structured using the codename, this has lead to a plathora
of unpredictable and buggy behaviour when synchronizing upstream
repositories with 'codename != distribution'.
This change fixes these problems by introducing and using a
"distribution" field for both the units_deb_release and
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