Compress Azure, HyperV and EC2 images

[simaishi]

Azure, HyperV and EC2 images are not compressed during imagefactory build. zip compressing the images so the image size will be comparable to other images.

@adahms It might affect documentation, so fyi... This is upstream only change for now, and will go to Gaprindashvili and later branches.

[miq-bot]

Checked commit simaishi@de73e3e with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. 👍

[simaishi]

Hammer backport details:

$ git log -1
commit 806577c35db60283e79d841cd153428153aad38a
Author: Nick Carboni <ncarboni@redhat.com>
Date:   Fri Oct 5 11:19:12 2018 -0400

    Merge pull request #289 from simaishi/compress_images
    
    Compress Azure, HyperV and EC2 images
    
    (cherry picked from commit 52b8be90f5fb289b90fedc7e5b5fc37add335c96)

[simaishi]

Gaprindashvili backport details:

$ git log -1
commit 32966b45b828e071fc7556f1bb78a2d0f870127f
Author: Nick Carboni <ncarboni@redhat.com>
Date:   Fri Oct 5 11:19:12 2018 -0400

    Merge pull request #289 from simaishi/compress_images
    
    Compress Azure, HyperV and EC2 images
    
    (cherry picked from commit 52b8be90f5fb289b90fedc7e5b5fc37add335c96)