Use mattermost v5 module (#1192)

vendor/github.com/mattermost/ldap/Makefile

@@ -0,0 +1,82 @@
+.PHONY: default install build test quicktest fmt vet lint 
+
+# List of all release tags "supported" by our current Go version
+# E.g. ":go1.1:go1.2:go1.3:go1.4:go1.5:go1.6:go1.7:go1.8:go1.9:go1.10:go1.11:go1.12:"
+GO_RELEASE_TAGS := $(shell go list -f ':{{join (context.ReleaseTags) ":"}}:' runtime)
+
+# Only use the `-race` flag on newer versions of Go (version 1.3 and newer)
+ifeq (,$(findstring :go1.3:,$(GO_RELEASE_TAGS)))
+	RACE_FLAG :=
+else
+	RACE_FLAG := -race -cpu 1,2,4
+endif
+
+# Run `go vet` on Go 1.12 and newer. For Go 1.5-1.11, use `go tool vet`
+ifneq (,$(findstring :go1.12:,$(GO_RELEASE_TAGS)))
+	GO_VET := go vet \
+		-atomic \
+		-bool \
+		-copylocks \
+		-nilfunc \
+		-printf \
+		-rangeloops \
+		-unreachable \
+		-unsafeptr \
+		-unusedresult \
+		.
+else ifneq (,$(findstring :go1.5:,$(GO_RELEASE_TAGS)))
+	GO_VET := go tool vet \
+		-atomic \
+		-bool \
+		-copylocks \
+		-nilfunc \
+		-printf \
+		-shadow \
+		-rangeloops \
+		-unreachable \
+		-unsafeptr \
+		-unusedresult \
+		.
+else
+	GO_VET := @echo "go vet skipped -- not supported on this version of Go"
+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
+
+vet:
+	$(GO_VET)
+
+# 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=`command -v golint >/dev/null 2>&1 && golint ./... 2>&1`; \
+	if [ "$$OUTPUT" ]; then \
+		echo "golint errors:"; \
+		echo "$$OUTPUT"; \
+		exit 1; \
+	fi