Before this change:
```
gwmux, err = sctx.registerGateway([]grpc.DialOption{grpc.WithInsecure()})
if err != nil { return err; }
```
caused the Etcd.Serve() method finish without sctx.serversC channel being closed.
The code closing Etcd got stuck waiting for all the servers to be running.
Signed-off-by: Piotr Tabor <ptab@google.com>
The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Ensure the client which access etcd via grpc-gateway won't
be limited by the MaxCallRecvMsgSize. Here we choose the same
default value of etcdcli as grpc-gateway's MaxCallRecvMsgSize.
Fix https://github.com/etcd-io/etcd/issues/12576
