Refactor use protbof to send messages and remove unused "distance" metrics

go.sum

@@ -12,6 +12,8 @@ github.com/containerd/continuity v0.0.0-20190426062206-aaeac12a7ffc h1:TP+534wVl
 github.com/containerd/continuity v0.0.0-20190426062206-aaeac12a7ffc/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
 github.com/cyrilix/robocar-base v0.0.0-20191229155957-683a9d53e6b8 h1:/UQf7jFGW3G3EgysANvJVjQofbHly8/VSoEwGc2xDVI=
 github.com/cyrilix/robocar-base v0.0.0-20191229155957-683a9d53e6b8/go.mod h1:/KZidG8Y4sKxCCkTcswpKz20oFN3j62tJvamEHcSgLM=
+github.com/cyrilix/robocar-protobuf/go v0.0.0-20200101000356-accf7184079a h1:IkvehlOZuaxE6T62Kdr1iYjMmcllUOPi/ZQhMhzp844=
+github.com/cyrilix/robocar-protobuf/go v0.0.0-20200101000356-accf7184079a/go.mod h1:I+i6Ujns+4DmRmmUej56MItlmT4K2zlMZ35vZrHEfQ4=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/docker/distribution v2.7.1-0.20190205005809-0d3efadf0154+incompatible h1:dvc1KSkIYTVjZgHf/CTC2diTYC8PzhaA5sFISRfNVrE=
@@ -36,6 +38,7 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/gorilla/context v1.1.1 h1:AWwleXJkX/nhcU9bZSnZoi3h/qGYqQAGhq6zZe/aQW8=