NETOBSERV-505 NOO fails to build with go1.18 and above (#146)

* NETOBSERV-505 NOO fails to build with go1.18 and above

Use 'go install' to install the executable.  Note that it still calls
'go get' to update dependencies in go.mod.  This stopped working in
go1.18 because of https://go.dev/doc/go-get-install-deprecation.

In making this change, kustomize broke and no longer installed.  The problem
is documented in kubernetes-sigs/kustomize#3618.
The solution is to use at least v4.5.2.  kustomize was upgraded to 4.5.7
from 3.8.8 and everything still worked.

* Set GOFLAGS to ignore vendor directory.

There is also no need to update dependencies since it is installing a
specific version of an executable.

Makefile

@@ -176,30 +176,30 @@ run: generate fmt lint ## Run a controller from your host.
 
 CONTROLLER_GEN = $(shell pwd)/bin/controller-gen
 controller-gen: ## Download controller-gen locally if necessary.
-	$(call go-get-tool,$(CONTROLLER_GEN),sigs.k8s.io/controller-tools/cmd/controller-gen@v0.6.1)
+	$(call go-install-tool,$(CONTROLLER_GEN),sigs.k8s.io/controller-tools/cmd/controller-gen@v0.6.1)
 
 KUSTOMIZE = $(shell pwd)/bin/kustomize
 kustomize: ## Download kustomize locally if necessary.
-	$(call go-get-tool,$(KUSTOMIZE),sigs.k8s.io/kustomize/kustomize/v3@v3.8.8)
+	$(call go-install-tool,$(KUSTOMIZE),sigs.k8s.io/kustomize/kustomize/v4@v4.5.7)
 
 ENVTEST = $(shell pwd)/bin/setup-envtest
 envtest: ## Download envtest-setup locally if necessary.
-	$(call go-get-tool,$(ENVTEST),sigs.k8s.io/controller-runtime/tools/setup-envtest@latest)
+	$(call go-install-tool,$(ENVTEST),sigs.k8s.io/controller-runtime/tools/setup-envtest@latest)
 
 CRDOC = $(shell pwd)/bin/crdoc
 crdoc: ## Download crdoc locally if necessary.
-	$(call go-get-tool,$(CRDOC),fybrik.io/crdoc@v0.5.2)
+	$(call go-install-tool,$(CRDOC),fybrik.io/crdoc@v0.5.2)
 
-# go-get-tool will 'go get' any package $2 and install it to $1.
+# go-install-tool will 'go install' any package $2 and install it to $1.
 PROJECT_DIR := $(shell dirname $(abspath $(firstword $(MAKEFILE_LIST))))
-define go-get-tool
+define go-install-tool
 @[ -f $(1) ] || { \
 set -e ;\
 TMP_DIR=$$(mktemp -d) ;\
 cd $$TMP_DIR ;\
 go mod init tmp ;\
 echo "Downloading $(2)" ;\
-GOBIN=$(PROJECT_DIR)/bin go get $(2) ;\
+GOBIN=$(PROJECT_DIR)/bin GOFLAGS="-mod=mod" go install $(2) ;\
 rm -rf $$TMP_DIR ;\
 }
 endef