* Add new fedora container to run imagefactory
* Make architecture class from py attrs and make it raise exceptions
* Change build-image script to primarily invoke imagefactory directly. A
second wrapper will be added to support running in kubernetes if
needed.
* use a flag to determine if we want an RC or not
* Convert rldict and sigdict to an AttributeDict to allow access via
__getattr__
* add fedora_release variable to configs for controlling icicle
templates
* build_image.py script to generate per-architecture XML files used by
imagefactory
* refactor time to call utcnow() once
* add jinja types to development dependencies until we move past jinja
2.x
* Generate TDL templates per architecture for each image variant on
demand
* Generate imagefactory and copy commands to execute image build
* Refactor Kubernetes job template to be generic for all current jobs
