Deleting a cluster should delete the kubectl context for the cluster

[mrichmon]

I have multiple kops managed clusters. When I delete a cluster using "kops delete cluster", it should clean up kubectl by removing the kubectl context for the deleted cluster.

[chrislovecnm]

@mrichmon I am really trying not to make a comment about the issue number. I will add this to our roadmap issue

[mrichmon]

@chrislovecnm Heh. This issue number was a missed opportunity.

[yissachar]

I believe #287 is the same issue.

[chrislovecnm]

@mrichmon closing in favor of the other number ;)