This messes with the GOPATH in a way that confuses ginkgo,
and doesn't appear to be necessary to run the tests

Removes likely unnecessary use of sudo, though it should be noted that
e2e_node_suite_test.go uses sudo to do something with locksmithd, so you
currently end up using it anyway.

Updates the error for not having ginkgo built to recommend the new vendor/
path for ginkgo, and to recommend using make instead of hack/build-go.sh

Should resolve #25682