add envoy version info into troubleshooting guide (#1849)
add envoy version info into troubleshooting guide (#1849)

* add envoy version info into troubleshooting guide

* add envoy version info into troubleshooting guide

* add envoy version info into troubleshooting guide

geeknoid/istio.github.io,istio/istio.io,geeknoid/istio.github.io,istio/istio.io,geeknoid/istio.github.io,istio/istio.io,istio/istio.io,linsun/istio.github.io,geeknoid/istio.github.io,geeknoid/istio.github.io,linsun/istio.github.io,linsun/istio.github.io,istio/istio.io,linsun/istio.github.io,linsun/istio.github.io,istio/istio.io,istio/istio.io