#236: Add on-by-default option to dashboard

[isugimpy]

This PR aims to fix the issue raised in #236 where namespaces must explicitly be enabled to show up. Noteworthy, I'm not aware of a way to do a LabelSelector with a != value using the map syntax that was already being used in namespace-list.go, so I constructed the selector manually. If there's a more preferred way to handle this, I'm certainly open to updating it. This should be ready to review. I've tested it on a real cluster and it worked as expected.

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[codecov]

Codecov Report

Merging #308 (270ea81) into master (e222dbb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #308   +/-   ##
=======================================
  Coverage   55.21%   55.21%           
=======================================
  Files           8        8           
  Lines         527      527           
=======================================
  Hits          291      291           
  Misses        206      206           
  Partials       30       30           

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[lucasreed]

@isugimpy Hey thanks a ton, this change LGTM, appreciate you taking the time 🎉

Once tests past after bringing this branch up to date we'll get it merged.