Revert "Not to send legacy quota for v2 config." (envoyproxy#725)

* Revert "Strip out "spiffe://" in the identity (envoyproxy#719)"

This reverts commit 99a482f.

* Revert "Revert "Remove -release in filename when doing release build of proxy (envoyproxy#704)" (envoyproxy#723)"

This reverts commit 13669ce.

* Revert "Not to send legacy quota for v2 config. (envoyproxy#722)"

This reverts commit aaf25ca.

src/envoy/mixer/config.cc

@@ -113,10 +113,6 @@ void HttpMixerConfig::Load(const Json::Object& json) {
   ReadTransportConfig(json, http_config.mutable_transport());
 
   has_v2_config = ReadV2Config(json, &http_config);
-  if (has_v2_config) {
-    // If v2 config is valid, clear v1 legacy_quotas.
-    legacy_quotas.clear();
-  }
 }
 
 void HttpMixerConfig::CreateLegacyRouteConfig(