[cloud] #131: make docker archived image get imported with lowercase tag

[Fedora Cloud Trac Tickets]

#131: make docker archived image get imported with lowercase tag
-----------------------+---------------------
 Reporter:  dustymabe  |      Owner:
     Type:  task       |     Status:  new
 Priority:  normal     |  Milestone:  Future
Component:  ---        |   Keywords:  meeting
-----------------------+---------------------
 Our docker image has a repositories file with this in it:

 ```
 {"Fedora-Docker-Base-23_TC1-20150929.x86_64": {"latest":
 "27653b989fba2fada76e804f4112b87d7b013758e99bbb88a26c070dbcae5962"}}
 ```

 This means that the docker image gets tagged with Fedora-Docker-Base-
 23_TC1-20150929.x86_64 when it gets loaded in. Unfortunately if you try to
 build on top of this image by having a Dockerfile with `FROM Fedora-
 Docker-Base-23_TC1-20150929.x86_64` then you will get an error because
 only lowercase letters are allowed in tags of images in a registery:

 "[a-z0-9]+(?:[._-][a-z0-9]+)*"


 We should update this so that users can have a better experience.


 [1] - //dl.fedoraproject.org/pub/alt/stage/23_TC1/Docker/x86_64/Fedora-
 Docker-Base-23_TC1-20150929.x86_64.tar.xz

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Ticket URL: <https://fedorahosted.org/cloud/ticket/131>
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