Update federation target to etcd/clientv3 (#6119)

With CoreDNS now supporting etcdv3 as the DNS backend, we
can update our federation target to etcdv3. Users will now be
able to use etcdv3 server as the federation backbone.

Minio will update bucket data to etcdv3 and CoreDNS can pick
that data up and serve it as bucket style DNS path.

vendor/github.com/grpc-ecosystem/go-grpc-middleware/util/backoffutils/backoff.go

@@ -0,0 +1,23 @@
+// Copyright 2016 Michal Witkowski. All Rights Reserved.
+// See LICENSE for licensing terms.
+
+/*
+Backoff Helper Utilities
+
+Implements common backoff features.
+*/
+package backoffutils
+
+import (
+	"math/rand"
+	"time"
+)
+
+// JitterUp adds random jitter to the duration.
+//
+// This adds or substracts time from the duration within a given jitter fraction.
+// For example for 10s and jitter 0.1, it will returna  time within [9s, 11s])
+func JitterUp(duration time.Duration, jitter float64) time.Duration {
+	multiplier := jitter * (rand.Float64()*2 - 1)
+	return time.Duration(float64(duration) * (1 + multiplier))
+}