Add DC Resources API

[OdedViner]

Add elements to DB via admin
http://127.0.0.1:8000/admin/resoucesdc/resoucesdc/

Get APIs via UI:
http://127.0.0.1:8000/resoucesdc/resourcesdc/

Get API via CLI: [All DCs]

$ curl http://127.0.0.1:8000/resoucesdc/resourcesdc/
[{"id":1,"dc":"dc-cp","storage":100,"cpu":200,"memory":300}]

Get API via CLI: [for specific DC]

$ curl http://127.0.0.1:8000/resoucesdc/resourcesdc/1/
{"id":1,"dc":"dc-cp","storage":100,"cpu":200,"memory":300}

Change cpu parma to 555:

$ curl -X PATCH -H "Content-Type: application/json" -d '{"cpu": "555"}' http://127.0.0.1:8000/resoucesdc/resourcesdc/1/
{"id":1,"dc":"dc-cp","storage":100,"cpu":555,"memory":300}

[openshift-ci]

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[jimdevops19]

How is it going here? Let me know if any help needed @OdedViner @petr-balogh