Don't autofill kubernetes namespace

Zeger-Jan van de Wegrequested to merge
zj-kube-service-auto-fill into master

Screenshot

Screen_Shot_2017-04-04_at_09.39.29

Warning when renaming:

Screen_Shot_2017-04-04_at_11.13.03

What are the relevant issue numbers?

First iteration for gitlab-org/gitlab-ce#28888

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