test: deflake admin test by not using LDS (#7226)
test: deflake admin test by not using LDS (#7226)

TBD (someone else) why the two don't play well together

Signed-off-by: Alyssa Wilk <b9253d1ec9cc3e9d2aab68d288ba3dab3452adf6@chromium.org>

eklitzke/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,jrajahalme/envoy,lizan/envoy,istio/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,lyft/envoy,istio/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy,lizan/envoy,lizan/envoy,eklitzke/envoy,istio/envoy,envoyproxy/envoy,eklitzke/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,lizan/envoy,eklitzke/envoy,eklitzke/envoy,jrajahalme/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lizan/envoy,istio/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,lizan/envoy,istio/envoy,envoyproxy/envoy,istio/envoy,lyft/envoy,jrajahalme/envoy