init go mod with ldap dependency

vendor/gopkg.in/ldap.v2/Makefile

@@ -0,0 +1,52 @@
+.PHONY: default install build test quicktest fmt vet lint 
+
+GO_VERSION := $(shell go version | cut -d' ' -f3 | cut -d. -f2)
+
+# Only use the `-race` flag on newer versions of Go
+IS_OLD_GO := $(shell test $(GO_VERSION) -le 2 && echo true)
+ifeq ($(IS_OLD_GO),true)
+	RACE_FLAG :=
+else
+	RACE_FLAG := -race -cpu 1,2,4
+endif
+
+default: fmt vet lint build quicktest
+
+install:
+	go get -t -v ./...
+
+build:
+	go build -v ./...
+
+test:
+	go test -v $(RACE_FLAG) -cover ./...
+
+quicktest:
+	go test ./...
+
+# Capture output and force failure when there is non-empty output
+fmt:
+	@echo gofmt -l .
+	@OUTPUT=`gofmt -l . 2>&1`; \
+	if [ "$$OUTPUT" ]; then \
+		echo "gofmt must be run on the following files:"; \
+		echo "$$OUTPUT"; \
+		exit 1; \
+	fi
+
+# Only run on go1.5+
+vet:
+	go tool vet -atomic -bool -copylocks -nilfunc -printf -shadow -rangeloops -unreachable -unsafeptr -unusedresult .
+
+# https://github.com/golang/lint
+# go get github.com/golang/lint/golint
+# Capture output and force failure when there is non-empty output
+# Only run on go1.5+
+lint:
+	@echo golint ./...
+	@OUTPUT=`golint ./... 2>&1`; \
+	if [ "$$OUTPUT" ]; then \
+		echo "golint errors:"; \
+		echo "$$OUTPUT"; \
+		exit 1; \
+	fi