Script fixes related to issues appeared during writing a Docker documentation

Bartek Wronarequested to merge
bw_docker_docs into develop
  1. build_instance.sh supports --help option
  2. Image registry path is supplemented with required trailing slash character.
  3. Support for binaries export from built docker image. Extracted binaries are also stored as artifacts produced by prepare_hived_data_5m_image job, to be available for other jobs.
Edited by Bartek Wrona

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