Revert "Apply plugin config per-repo rather than on all repos. (#1229)" (#1230)
Revert "Apply plugin config per-repo rather than on all repos. (#1229)" (#1230)

This reverts commit 44ec63325fd2d131d9afc72169a03c078928fa32.
istio/test-infra,istio/test-infra,istio/test-infra,istio/test-infra