fix FactoryRegistry::replaceFactoryForTest() (#2664)
fix FactoryRegistry::replaceFactoryForTest() (#2664)

Signed-off-by: James Sedgwick <49021315ec752fa4eb8675f9e52a3d13d8caa498@lyft.com>
eklitzke/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,lyft/envoy,lyft/envoy,lyft/envoy,envoyproxy/envoy,istio/envoy,dnoe/envoy,lizan/envoy,sebrandon1/envoy,lyft/envoy,lizan/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy,sebrandon1/envoy,dnoe/envoy,jrajahalme/envoy,dnoe/envoy,istio/envoy,istio/envoy,envoyproxy/envoy,craffert0/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lizan/envoy,lizan/envoy,dnoe/envoy,sebrandon1/envoy,craffert0/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,craffert0/envoy,envoyproxy/envoy,eklitzke/envoy,envoyproxy/envoy,lizan/envoy,envoyproxy/envoy,sebrandon1/envoy,envoyproxy/envoy,dnoe/envoy,lizan/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,sebrandon1/envoy,envoyproxy/envoy,eklitzke/envoy,craffert0/envoy,istio/envoy,lyft/envoy,lyft/envoy,jrajahalme/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,jrajahalme/envoy,jrajahalme/envoy,istio/envoy