Add image version metadata in docker image

This is needed by the ade tool, which relies on '/etc/image_version' to determine in what environment it is running

Signed-off-by: Ritesh Raj Sarraf ritesh.sarraf@collabora.com

added 3 commits

• 866b2f3b...f4785a1d - 2 commits from branch master
• 5b4c747d - Add image version metadata in docker image

Compare with previous version

The image has built successfully in playground: https://jenkins.apertis.org/job/playground/job/ritesh/job/apertis-18.09/job/images/job/apertis-docker-images/25/

And the failing job about ade, which this MR will hopefully fix, is: https://jenkins.apertis.org/job/playground/job/ritesh/job/apertis-18.09/job/samples/job/build-helloworld-newport/2/console

merged

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