Zero-initialize mock_time_. (#973)
Zero-initialize mock_time_. (#973)

Found with MemorySanitizer.
lyft/envoy,fengli79/envoy,amalgam8/envoy,envoyproxy/envoy-wasm,sebrandon1/envoy,istio/envoy,dnoe/envoy,rlazarus/envoy,envoyproxy/envoy-wasm,tschroed/envoy,lyft/envoy,jrajahalme/envoy,amalgam8/envoy,lyft/envoy,jrajahalme/envoy,eklitzke/envoy,jrajahalme/envoy,istio/envoy,eklitzke/envoy,sebrandon1/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,lizan/envoy,htuch/envoy,eklitzke/envoy,istio/envoy,lizan/envoy,istio/envoy,envoyproxy/envoy,craffert0/envoy,lyft/envoy,tschroed/envoy,tdmackey/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,envoyproxy/envoy,lizan/envoy,envoyproxy/envoy-wasm,dnoe/envoy,craffert0/envoy,craffert0/envoy,istio/envoy,jrajahalme/envoy,lizan/envoy,envoyproxy/envoy,lyft/envoy,lizan/envoy,envoyproxy/envoy,htuch/envoy,eklitzke/envoy,istio/envoy,envoyproxy/envoy,lizan/envoy,tdmackey/envoy,eklitzke/envoy,eklitzke/envoy,fengli79/envoy,dnoe/envoy,jrajahalme/envoy,fengli79/envoy,dnoe/envoy,jrajahalme/envoy,fengli79/envoy,envoyproxy/envoy,amalgam8/envoy,rlazarus/envoy,tdmackey/envoy,envoyproxy/envoy-wasm,tdmackey/envoy,amalgam8/envoy,envoyproxy/envoy,rlazarus/envoy,envoyproxy/envoy,htuch/envoy,sebrandon1/envoy,tschroed/envoy,envoyproxy/envoy,sebrandon1/envoy,dnoe/envoy,envoyproxy/envoy,envoyproxy/envoy,craffert0/envoy,istio/envoy,rlazarus/envoy,sebrandon1/envoy