Remove hack/tools/Makefile

[thockin]

I'm peeling some obvious commits off my workspaces branch.

This doesn't seem to be used - all scripts call go install themselves.

/kind cleanup

NONE

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[liggitt]

I don't have strong feelings either way on this, but if we drop it, we should also remove the README reference (6974d32#diff-b40431cffe7f15c4e0cf7762e25843e8e6696c08be92805372ca43a263aca38a)

[dims]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, thockin

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[thockin]

/retest