MM-12389 Update segment library to v3 (#11472)

* Update analytics-go dependency

* Migrate from segment library v2 to v3

* Reinclude gorilla/handlers module

* Fix missing module

* Remove reference to outdated analytics module

vendor/github.com/segmentio/analytics-go/Makefile

@@ -1,10 +1,31 @@
+ifndef CIRCLE_ARTIFACTS
+CIRCLE_ARTIFACTS=tmp
+endif
+
+bootstrap:
+	.buildscript/bootstrap.sh
+
+dependencies:
+	@go get -v -t ./...
+
 vet:
-	@godep go vet ./...
+	@go vet ./...
 
-build:
-	@godep go build
+test: vet
+	@mkdir -p ${CIRCLE_ARTIFACTS}
+	@go test -race -coverprofile=${CIRCLE_ARTIFACTS}/cover.out .
+	@go tool cover -func ${CIRCLE_ARTIFACTS}/cover.out -o ${CIRCLE_ARTIFACTS}/cover.txt
+	@go tool cover -html ${CIRCLE_ARTIFACTS}/cover.out -o ${CIRCLE_ARTIFACTS}/cover.html
 
-test:
-	@godep go test -race -cover ./...
+build: test
+	@go build ./...
 
-.PHONY: vet build test
+e2e:
+	@if [ "$(RUN_E2E_TESTS)" != "true" ]; then \
+	  echo "Skipping end to end tests."; else \
+		go get github.com/segmentio/library-e2e-tester/cmd/tester; \
+		tester -segment-write-key=$(SEGMENT_WRITE_KEY) -webhook-auth-username=$(WEBHOOK_AUTH_USERNAME) -webhook-bucket=$(WEBHOOK_BUCKET) -path='cli'; fi
+
+ci: dependencies test e2e
+
+.PHONY: bootstrap dependencies vet test e2e ci