RPM Support

Having run the migration 0047_add_modulemd_dependencies_field.py in my pulp deployment that syncs Fedora 29 content I saw that the dependencies of modules can be duplicated:

db.units_modulemd.find({"dependencies": {$ne: []}})[6]

{                                                                                                                                                                                                                  
        "_id" : "042a0ffd-0475-40ef-bba6-cf9380ab931c",                                                                                                                                                            
        "pulp_user_metadata" : {                                                                                                                                                                                   

        },
        "_last_updated" : 1539260489,
        "_storage_path" : "/var/lib/pulp/content/units/modulemd/b0/f1a8a4a6229d2531c4004f0d70499933a040f4d6428827d6c41aeaa81ed66b",                                                                               
        "downloaded" : true,
        "name" : "reviewboard",
        "stream" : "2.5",
        "version" : NumberLong("20180828143308"),
        "context" : "083bce86",
        "arch" : "x86_64",
        "summary" : "A web-based code review tool",
        "description" : "Review Board is a powerful web-based code review tool that offers developers an easy way to handle code reviews. It scales well from small projects to large companies and offers a varie$y of tools to take much of the stress and time out of the code review process.",
        "profiles" : {
                "default" : [
                        "ReviewBoard"
                ],
                "server" : [
                        "ReviewBoard"
                ]
        },
        "artifacts" : [
                "ReviewBoard-0:2.5.17-17.module_1631+4353a891.noarch",
                "python-django-haystack-docs-0:2.4.1-12.module_1631+4353a891.noarch",
                "python2-django-evolution-1:0.7.7-12.module_1631+4353a891.noarch",
                "python2-django-haystack-0:2.4.1-12.module_1631+4353a891.noarch",
                "python2-django-multiselectfield-0:0.1.3-10.module_1631+4353a891.noarch",
                "python2-django-pipeline-0:1.3.27-11.module_1631+4353a891.noarch",
                "python2-djblets-0:0.9.9-13.module_1631+4353a891.noarch",
                "python2-markdown-0:2.4.1-12.module_2085+40241970.noarch",
                "python3-markdown-0:2.4.1-12.module_2085+40241970.noarch"
        ],
        "checksum" : "92c01be4ef52dab5aa75e0d31562b1bbb45e088b013900c8fe90f0c744cf8431",
        "_ns" : "units_modulemd",
        "_content_type_id" : "modulemd",
        "dependencies" : [
                {
                        "platform" : [
                                "f29"
                        ],
                        "django" : [
                                "1.6"
                        ]
                },
                {
                        "platform" : [
                                "f29"
                        ],
                        "django" : [
                                "1.6"
                        ]
                }
        ]
}

For comparison, the original modular metadata:

document: modulemd
version: 2
data:
  name: reviewboard
  stream: 2.5
  version: 20180828143308
  context: 083bce86
  arch: x86_64
  summary: A web-based code review tool
  description: >-
    Review Board is a powerful web-based code review tool that offers developers an
    easy way to handle code reviews. It scales well from small projects to large companies
    and offers a variety of tools to take much of the stress and time out of the code
    review process.
  license:
    module:
    - MIT
    content:
    - BSD
    - LGPLv3
    - MIT
    - MIT and (MIT or GPLv2)
  xmd:
    mbs:
      mse: TRUE
      scmurl: https://src.fedoraproject.org/modules/reviewboard.git?#0fc31243aa85666e4e584aebda7a74e430cd0698
      commit: 0fc31243aa85666e4e584aebda7a74e430cd0698
      buildrequires:
        platform:
          ref: f29
          stream: f29
          context: 00000000
          version: 5
          filtered_rpms: []
        django:
          ref: da53d66d3db1aa5f6afd75887b00fa26849bcc0a
          stream: 1.6
          context: 6c81f848
          version: 20180828135711
          filtered_rpms: []
      rpms:
        python-django-multiselectfield:
          ref: 149bf58875fb7b55efe29e1735baf96d44eb99a9
        python-markdown:
          ref: 96c1b2f925c2ad3b7aae04ab7ebf25ae1d714ebf
        python-django-evolution:
          ref: 512424e1fc4b99f6f74c01a4130a4d9402b56b4e
        python-django-pipeline:
          ref: f019137be96cf86f49a81001fef47a0c7ab6aa35
        ReviewBoard:
          ref: 5d28213f6a797e5ce28ad05ab23f80fe67353da8
        python-djblets:
          ref: d5634779089456ff3d0ac7b78eec81e13ff4c733
  dependencies:
  - buildrequires:
      django: [1.6]
      platform: [f29]
    requires:
      django: [1.6]
      platform: [f29]
# ------->%---------------------