[test][docker] Move test-image pull function to a test submodule on request

2 jobs for issue-63 in 18 minutes and 23 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #157657
docker-build
build_linux_36

00:15:09

73.0%
passed #157658
macosx
build_macosx_36

00:18:18

73.0%