CRI Provider implementation (#195)

* First commit of CRI provider. Vendor deps not included

* First commit of CRI provider. Vendor deps not included

* Tidy up comments and format code

* vendor grpc, CRI APIs, update protobuf and tidy logging

* First commit of CRI provider. Vendor deps not included

* Tidy up comments and format code

* vendor grpc, CRI APIs, update protobuf and tidy logging

* Add README

* Fix errors in make test

vendor/google.golang.org/grpc/benchmark/grpc_testing/payloads.proto

@@ -0,0 +1,40 @@
+// Copyright 2016 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package grpc.testing;
+
+message ByteBufferParams {
+  int32 req_size = 1;
+  int32 resp_size = 2;
+}
+
+message SimpleProtoParams {
+  int32 req_size = 1;
+  int32 resp_size = 2;
+}
+
+message ComplexProtoParams {
+  // TODO (vpai): Fill this in once the details of complex, representative
+  //              protos are decided
+}
+
+message PayloadConfig {
+  oneof payload {
+    ByteBufferParams bytebuf_params = 1;
+    SimpleProtoParams simple_params = 2;
+    ComplexProtoParams complex_params = 3;
+  }
+}