Make unix domain socket work with crictl

[saschagrunert]

Looks like we're facing those issues with the default implementation as well:

• Relax authority strictness for interoperability with other (existing) clients grpc/grpc-rust#243
• Support for h2 over UDS hyperium/h2#442

I was able to connect via grpccurl, which does not have to seem the issue when specifying the socket:

> sudo ./grpcurl -plaintext -unix -protoset cri.protoset cri.sock criapi.RuntimeService.Version

[saschagrunert]

Looks like the issue got solved with grpc/grpc-go#3730

[saschagrunert]

Trying to solve the other issue in h2: hyperium/h2#487

[saschagrunert]

The latest master of tonic would be required too, but I guess we can wait for the next release.

Ref: grpc/grpc-rust#443

[Ruilkyu]

Has 0.4.0 solved the problem?