Migrate from glide to official dependencies management tool: Go Module (#1136)

hack/Dockerfile

@@ -1,3 +1,4 @@
-FROM golang:1.10.2
+FROM golang:1.11.6
+ENV GO111MODULE on
 RUN wget -qO- https://download.docker.com/linux/static/stable/x86_64/docker-17.03.0-ce.tgz | tar xvz -C /usr/local/bin/ --strip 1
 RUN wget -qO- https://storage.googleapis.com/kubernetes-helm/helm-v2.9.1-linux-amd64.tar.gz | tar xvz -C /usr/local/bin/ --strip 1

hack/verify-gofmt.sh

@@ -13,7 +13,7 @@ find_files() {
 }
 
 GOFMT="gofmt -s"
-bad_files=$(find_files | grep -v '.glide/cache' | xargs $GOFMT -l)
+bad_files=$(find_files | xargs $GOFMT -l)
 if [[ -n "${bad_files}" ]]; then
   echo "!!! '$GOFMT' needs to be run on the following files: "
   echo "${bad_files}"

hack/verify-govet.sh

@@ -12,4 +12,4 @@ find_files() {
     \) -name '*.go'
 }
 
-find_files | grep -v '.glide/cache' | xargs -I@ bash -c "go tool vet @"
+find_files | xargs -I@ bash -c "go tool vet @"