nri: add experimental NRI plugin.

Add a common NRI 'service' plugin. It takes care of relaying
requests and respones to and from NRI (external NRI plugins)
and the high-level containerd namespace-independent logic of
applying NRI container adjustments and updates to actual CRI
and other containers.

The namespace-dependent details of the necessary container
manipulation operations are to be implemented by namespace-
specific adaptations. This NRI plugin defines the API which
such adaptations need to implement.

Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>

vendor/github.com/containerd/nri/Makefile

@@ -12,5 +12,166 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 
-all:
-	go build -v
+PROTO_SOURCES = $(shell find . -name '*.proto' | grep -v /vendor/)
+PROTO_GOFILES = $(patsubst %.proto,%.pb.go,$(PROTO_SOURCES))
+PROTO_INCLUDE = -I$(PWD):/usr/local/include:/usr/include
+PROTO_OPTIONS = --proto_path=. $(PROTO_INCLUDE) \
+    --go_opt=paths=source_relative --go_out=. \
+    --go-ttrpc_opt=paths=source_relative --go-ttrpc_out=.
+PROTO_COMPILE = PATH=$(PATH):$(shell go env GOPATH)/bin; protoc $(PROTO_OPTIONS)
+
+GO_CMD     := go
+GO_BUILD   := $(GO_CMD) build
+GO_INSTALL := $(GO_CMD) install
+GO_TEST    := $(GO_CMD) test
+GO_LINT    := golint -set_exit_status
+GO_FMT     := gofmt
+GO_VET     := $(GO_CMD) vet
+
+GO_MODULES := $(shell $(GO_CMD) list ./...)
+
+GOLANG_CILINT := golangci-lint
+GINKGO        := ginkgo
+
+BUILD_PATH    := $(shell pwd)/build
+BIN_PATH      := $(BUILD_PATH)/bin
+COVERAGE_PATH := $(BUILD_PATH)/coverage
+
+PLUGINS := \
+	$(BIN_PATH)/logger \
+	$(BIN_PATH)/device-injector \
+	$(BIN_PATH)/hook-injector \
+	$(BIN_PATH)/differ \
+	$(BIN_PATH)/v010-adapter \
+	$(BIN_PATH)/template
+
+
+ifneq ($(V),1)
+  Q := @
+endif
+
+#
+# top-level targets
+#
+
+all: build build-plugins
+
+build: build-proto build-check
+
+clean: clean-plugins
+
+allclean: clean clean-cache
+
+test: test-gopkgs
+
+#
+# build targets
+#
+
+build-proto: $(PROTO_GOFILES)
+
+build-plugins: $(PLUGINS)
+
+build-check:
+	$(Q)$(GO_BUILD) -v $(GO_MODULES)
+
+#
+# clean targets
+#
+
+clean-plugins:
+	$(Q)rm -f $(PLUGINS)
+
+clean-cache:
+	$(Q)$(GO_CMD) clean -cache -testcache
+
+#
+# plugins build targets
+#
+
+$(BIN_PATH)/logger: $(wildcard plugins/logger/*.go)
+	$(Q)echo "Building $@..."; \
+	cd $(dir $<) && $(GO_BUILD) -o $@ .
+
+$(BIN_PATH)/device-injector: $(wildcard plugins/device-injector/*.go)
+	$(Q)echo "Building $@..."; \
+	cd $(dir $<) && $(GO_BUILD) -o $@ .
+
+$(BIN_PATH)/hook-injector: $(wildcard plugins/hook-injector/*.go)
+	$(Q)echo "Building $@..."; \
+	cd $(dir $<) && $(GO_BUILD) -o $@ .
+
+$(BIN_PATH)/differ: $(wildcard plugins/differ/*.go)
+	$(Q)echo "Building $@..."; \
+	cd $(dir $<) && $(GO_BUILD) -o $@ .
+
+$(BIN_PATH)/v010-adapter: $(wildcard plugins/v010-adapter/*.go)
+	$(Q)echo "Building $@..."; \
+	cd $(dir $<) && $(GO_BUILD) -o $@ .
+
+$(BIN_PATH)/template: $(wildcard plugins/template/*.go)
+	$(Q)echo "Building $@..."; \
+	cd $(dir $<) && $(GO_BUILD) -o $@ .
+
+#
+# test targets
+#
+
+test-gopkgs: ginkgo-tests
+
+ginkgo-tests:
+	$(Q)$(GINKGO) run \
+	    --race \
+	    --trace \
+	    --cover \
+	    --covermode atomic \
+	    --output-dir $(COVERAGE_PATH) \
+	    --junit-report junit.xml \
+	    --coverprofile coverprofile \
+	    --succinct \
+	    -r .; \
+	$(GO_CMD) tool cover -html=$(COVERAGE_PATH)/coverprofile -o $(COVERAGE_PATH)/coverage.html
+
+codecov: SHELL := $(shell which bash)
+codecov:
+	bash <(curl -s https://codecov.io/bash) -f $(COVERAGE_PATH)/coverprofile
+
+#
+# other validation targets
+#
+
+fmt format:
+	$(Q)$(GO_FMT) -s -d -e .
+
+lint:
+	$(Q)$(GO_LINT) -set_exit_status ./...
+
+vet:
+	$(Q)$(GO_VET) ./...
+
+golangci-lint:
+	$(Q)$(GOLANG_CILINT) run
+
+#
+# proto generation targets
+#
+
+%.pb.go: %.proto
+	$(Q)echo "Generating $@..."; \
+	$(PROTO_COMPILE) $<
+
+#
+# targets for installing dependencies
+#
+
+install-protoc install-protobuf:
+	$(Q)./scripts/install-protobuf && \
+
+install-ttrpc-plugin:
+	$(Q)$(GO_INSTALL) github.com/containerd/ttrpc/cmd/protoc-gen-go-ttrpc@74421d10189e8c118870d294c9f7f62db2d33ec1
+
+install-protoc-dependencies:
+	$(Q)$(GO_INSTALL) google.golang.org/protobuf/cmd/protoc-gen-go@v1.28.0
+
+install-ginkgo:
+	$(Q)$(GO_INSTALL) -mod=mod github.com/onsi/ginkgo/v2/ginkgo