upgrade: add fix for 1.9.5

Istio 1.9.5 build is broken, see:
istio#32846

I am cherry picking fixing commit onto our release branch.
istio#32792

Change-Id: I853c0e126dd48383199e7ecf96aafe461278a332
Reviewed-on: https://gerrit.musta.ch/c/public/istio/+/1315
Reviewed-by: Stephen Chan <[email protected]>
Reviewed-by: Weibo He <[email protected]>

go.mod

@@ -19,6 +19,8 @@ replace github.com/imdario/mergo => github.com/imdario/mergo v0.3.5
 // See https://github.com/kubernetes/kubernetes/issues/92867, there is a bug in the library
 replace github.com/evanphx/json-patch => github.com/evanphx/json-patch v0.0.0-20190815234213-e83c0a1c26c8
 
+replace github.com/envoyproxy/go-control-plane => github.com/istio/go-control-plane v0.9.9-0.20210420150223-d760b7f6014b
+
 require (
 	cloud.google.com/go v0.73.0
 	contrib.go.opencensus.io/exporter/prometheus v0.2.0

go.sum

@@ -225,12 +225,6 @@ github.com/elazarl/goproxy v0.0.0-20180725130230-947c36da3153/go.mod h1:/Zj4wYkg
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
 github.com/emicklei/go-restful v2.9.5+incompatible h1:spTtZBk5DYEvbxMVutUuTyh1Ao2r4iyvLdACqsl/Ljk=
 github.com/emicklei/go-restful v2.9.5+incompatible/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
-github.com/envoyproxy/go-control-plane v0.6.9/go.mod h1:SBwIajubJHhxtWwsL9s8ss4safvEdbitLhGGK48rN6g=
-github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
-github.com/envoyproxy/go-control-plane v0.9.9-0.20210420150223-d760b7f6014b h1:TOooj2KErUY1emNhErCVC72Zhh/QDcJLoymu8EYMKRs=
-github.com/envoyproxy/go-control-plane v0.9.9-0.20210420150223-d760b7f6014b/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/evanphx/json-patch v0.0.0-20190815234213-e83c0a1c26c8 h1:DM7gHzQfHwIj+St8zaPOI6iQEPAxOwIkskvw6s9rDaM=
@@ -482,6 +476,8 @@ github.com/imdario/mergo v0.3.5/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJ
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
+github.com/istio/go-control-plane v0.9.9-0.20210420150223-d760b7f6014b h1:u/q82Q2SReyAlhp8BQ1S+g0Jm3qVuMAeoChkNs7eNJg=
+github.com/istio/go-control-plane v0.9.9-0.20210420150223-d760b7f6014b/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/istio/viper v1.3.3-0.20190515210538-2789fed3109c h1:EFWADU43GY2T7NIYYbIHWdrG2hRiWyGSHeON57ZADBE=
 github.com/istio/viper v1.3.3-0.20190515210538-2789fed3109c/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DMA2s=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=