Update etcd to v3.3.25

* Pinning bbold to use v1.3.3 to avoid adding the go.etcd.io/bbolt to go.mod:
  `go get github.com/coreos/[email protected]`
* Pinning grpc to use v1.29.1 to avoid an issue with naming package:
  `go get google.golang.org/[email protected]`
* Updating etcd:
  `go get github.com/coreos/[email protected]`
* Updating vendor folder:
  `go mod vendor`

go.mod

@@ -4,14 +4,28 @@ go 1.12
 
 require (
 	cloud.google.com/go/firestore v1.1.0
-	github.com/coreos/etcd v3.3.24+incompatible
+	github.com/coreos/bbolt v1.3.3 // indirect
+	github.com/coreos/etcd v3.3.25+incompatible
 	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf // indirect
+	github.com/dustin/go-humanize v1.0.0 // indirect
+	github.com/gogo/protobuf v1.3.1 // indirect
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
 	github.com/google/btree v1.0.0 // indirect
+	github.com/google/uuid v1.1.1 // indirect
+	github.com/grpc-ecosystem/go-grpc-middleware v1.2.1 // indirect
+	github.com/grpc-ecosystem/grpc-gateway v1.14.6 // indirect
 	github.com/hashicorp/consul/api v1.1.0
-	github.com/json-iterator/go v1.1.6 // indirect
+	github.com/jonboulle/clockwork v0.2.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.1 // indirect
-	golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5
+	github.com/prometheus/client_golang v1.7.1 // indirect
+	github.com/spf13/cobra v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/tmc/grpc-websocket-proxy v0.0.0-20200427203606-3cfed13b9966 // indirect
+	go.uber.org/zap v1.15.0 // indirect
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
 	google.golang.org/api v0.13.0
-	google.golang.org/grpc v1.21.1
+	google.golang.org/grpc v1.29.1
+	sigs.k8s.io/yaml v1.2.0 // indirect
 )