[etcd] Downgrade to release-3.5 branch with otel fix. (#4139)

* Downgrade etcd to release-3.5 branch with otel fix.

See etcd-io/etcd#14312 for details of the needed
PR. Rewrite integration package imports from the 3.6.0.alpha.0 path to
the 3.5.5 path. Incidentally remove the go.etcd.io/etcd/client/v2 replace directive
since M3 is already on go 1.17 and release-3.5 branch indirectly pulls
in v2.305.4 which does exhibit the problem with sigs.k8s.io/json:
```
% go mod why sigs.k8s.io/json
(main module does not need package sigs.k8s.io/json)
```

Signed-off-by: Zack Train <ztrain@uber.com>

* Fix etcd/integration tests to use V3.

Signed-off-by: Zack Train <ztrain@uber.com>

* Missed edit for ClusterV3.

Signed-off-by: Zack Train <ztrain@uber.com>

Signed-off-by: Zack Train <ztrain@uber.com>

go.mod

@@ -59,18 +59,14 @@ require (
 	github.com/uber/tchannel-go v1.31.1-0.20220504180658-be708aa1a97d
 	github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a
 	github.com/willf/bitset v1.1.11
-	// etcd is currently on an alpha version to accomodate a GRPC version upgrade. See
-	// https://github.com/m3db/m3/issues/4090 for the followup task to move back to a stable version.
-	//  Gory details (why we're doing this):
-	//
-	//    - We import etcd/server/v3 via etcd/embed and etcd/testing/v3/frameworks/integration.
-	//    - etcd/server/v3 in 3.5.2 depends on pre 1.0 opentelemetry. Bleeding edge etcd depends on 1.0 opentelemetry
-	//    - M3 depends on 1.0 opentelemetry — this conflicts with etcd 3.5.2, but not bleeding edge etcd
-	go.etcd.io/etcd/api/v3 v3.6.0-alpha.0
-	go.etcd.io/etcd/client/pkg/v3 v3.6.0-alpha.0
-	go.etcd.io/etcd/client/v3 v3.6.0-alpha.0
-	go.etcd.io/etcd/server/v3 v3.6.0-alpha.0
-	go.etcd.io/etcd/tests/v3 v3.6.0-alpha.0
+	// etcd is currently on a pre-release 3.5.5 version to accomodate a GRPC version upgrade:
+	// - see https://github.com/m3db/m3/issues/4090 for the followup task to move back to a stable version
+	// - see https://github.com/etcd-io/etcd/issues/14268 for a detailed description of the issue
+	go.etcd.io/etcd/api/v3 v3.5.5-0.20220808200321-9e95685d0a6d
+	go.etcd.io/etcd/client/pkg/v3 v3.5.5-0.20220808200321-9e95685d0a6d
+	go.etcd.io/etcd/client/v3 v3.5.5-0.20220808200321-9e95685d0a6d
+	go.etcd.io/etcd/server/v3 v3.5.5-0.20220808200321-9e95685d0a6d
+	go.etcd.io/etcd/tests/v3 v3.5.5-0.20220808200321-9e95685d0a6d
 	go.opentelemetry.io/collector v0.45.0
 	go.opentelemetry.io/otel v1.4.1
 	go.opentelemetry.io/otel/bridge/opentracing v1.4.1
@@ -113,14 +109,14 @@ require (
 	github.com/dustin/go-humanize v1.0.0 // indirect
 	github.com/edsrzf/mmap-go v1.0.0 // indirect
 	github.com/felixge/httpsnoop v1.0.2 // indirect
+	github.com/form3tech-oss/jwt-go v3.2.3+incompatible // indirect
 	github.com/glycerine/go-unsnap-stream v0.0.0-20181221182339-f9677308dec2 // indirect
 	github.com/go-kit/log v0.2.0 // indirect
 	github.com/go-logfmt/logfmt v0.5.1 // indirect
 	github.com/go-logr/logr v1.2.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-playground/locales v0.13.0 // indirect
 	github.com/go-playground/universal-translator v0.17.0 // indirect
-	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/google/btree v1.0.1 // indirect
 	github.com/gorilla/handlers v1.5.1 // indirect
@@ -169,9 +165,9 @@ require (
 	github.com/twmb/murmur3 v1.1.6 // indirect
 	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
 	go.etcd.io/bbolt v1.3.6 // indirect
-	go.etcd.io/etcd/client/v2 v2.306.0-alpha.0 // indirect
-	go.etcd.io/etcd/pkg/v3 v3.6.0-alpha.0 // indirect
-	go.etcd.io/etcd/raft/v3 v3.6.0-alpha.0 // indirect
+	go.etcd.io/etcd/client/v2 v2.305.4 // indirect
+	go.etcd.io/etcd/pkg/v3 v3.5.5-0.20220808200321-9e95685d0a6d // indirect
+	go.etcd.io/etcd/raft/v3 v3.5.5-0.20220808200321-9e95685d0a6d // indirect
 	go.opencensus.io v0.23.0 // indirect
 	go.opentelemetry.io/collector/model v0.45.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.28.0 // indirect
@@ -182,7 +178,7 @@ require (
 	go.opentelemetry.io/otel/trace v1.4.1 // indirect
 	go.opentelemetry.io/proto/otlp v0.12.0 // indirect
 	go.uber.org/multierr v1.7.0 // indirect
-	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 // indirect
+	golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 // indirect
 	golang.org/x/lint v0.0.0-20210508222113-6edffad5e616 // indirect
 	golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b // indirect
 	golang.org/x/text v0.3.7 // indirect
@@ -214,19 +210,3 @@ replace github.com/google/flatbuffers => github.com/google/flatbuffers v1.12.1
 replace github.com/uber-go/atomic => github.com/uber-go/atomic v1.4.0
 
 replace google.golang.org/grpc => google.golang.org/grpc v1.40.1
-
-// TODO: this can be removed once M3 is on Go 1.17.x
-// This is here because of a dependency chain that makes client/v2 hard dependent on Go 1.17. Specifically:
-//~ /Code/m3 $ go mod why sigs.k8s.io/json
-// # sigs.k8s.io/json
-// github.com/m3db/m3/src/aggregator/integration
-// go.etcd.io/etcd/tests/v3/framework/integration
-// go.etcd.io/etcd/server/v3/etcdserver
-// go.etcd.io/etcd/server/v3/etcdserver/api/v2discovery
-// go.etcd.io/etcd/client/v2
-// sigs.k8s.io/json
-// This dependency chain is recently added,
-// (in https://github.com/etcd-io/etcd/commit/b5e4c2d3c483d9c3d03a0f97ae7b07607f38a5cc)
-// and not actually relevant to anything used by M3 (we are on client/v3).
-// Therefore, replace client/v2 to avoid the bad dependency chain until we upgrade.
-replace go.etcd.io/etcd/client/v2 => go.etcd.io/etcd/client/v2 v2.305.0-alpha.0.0.20211029212747-6656181d312a