Merge branch '1197-configurable-gitlab-repo-url' into 'master'

Make URL for GitLab repo used by manage versions script configurable

Closes #1197

See merge request charts/gitlab!711
6 jobs for master in 35 minutes and 50 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Prepare
passed #173892625
check_docs_internal_links

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  Stable
passed #173892626
stable

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  Specs
passed #173892627
production_specs

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  Qa
passed #173892628
production_helm_test

00:00:44

passed #173892630
qa

00:25:55

 
  Package
passed #173892632
lint_package

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