Charts/gitlab#869 allow disabling tls at all

Matthias van de Meentrequested to merge
(removed):charts/gitlab-869-allow-disabling-tls-at-all into master

Adds a global flag 'global.ingress.tls.enabled' which empties the Ingress.spec.tls field when disabled.

Fixes: https://gitlab.com/charts/gitlab/issues/869

Edited by DJ Mountney

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