SD-357 Implement method(non REST, python method) to upload image to content archive

SD-357 Implement method(non REST, python method) to upload, process and save a binary image on content archive by using a URL
SD-358 Implement method(non REST, python method) refetch an rendition for an content archive item
I've added this to be able to easier test the import feature, trying to mock half of Eve from unittests became no fun pretty fast :(