Add support for external cluster providers#113

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OriHoch wants to merge 3 commits intodatopian:masterfrom

OriHoch:custom-providers

Commits on Jan 16, 2020

add *.kube* to .dockerignore .gitignore
OriHoch
committed

Commits on Jan 20, 2020

add support for custom providers + misc. minor improvements and fixes
OriHoch
committed

Commits on Jan 22, 2020

improvements to cluster initialize and providers to support custom providers
OriHoch
committed