port to golangci and make travisci improvements

.travis.yml

@@ -5,15 +5,19 @@ go:
 
 go_import_path: sigs.k8s.io/kustomize
 
+sudo: false
+
+# Only clone the most recent commit.
+git:
+  depth: 1
+
+env:
+- GOLANGCI_RELEASE="v1.10.2"
+
 before_install:
   - source ./bin/consider-early-travis-exit.sh
-  - sudo apt-get install tree
-  - go get -u github.com/golang/lint/golint
-  - go get -u golang.org/x/tools/cmd/goimports
-  - go get -u github.com/onsi/ginkgo/ginkgo
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin ${GOLANGCI_RELEASE}
   - go get -u github.com/monopole/mdrip
-  - go get -u github.com/fzipp/gocyclo
-  - go get -u gopkg.in/alecthomas/gometalinter.v2 && gometalinter.v2 --install
 
 # Install must be set to prevent default `go get` to run.
 # The dependencies have already been vendored by `dep` so