Backport of recent fixes to backend/etcdv3#29203

Merged

jbardin merged 5 commits intov1.0from jbardin/etcv3-backports

Jul 20, 2021

+87-67

Commits on Jul 20, 2021

StateMgr must be able to return with locked state
jbardin
committed
go.mod,backend: update coreos/etcd dependency to release-3.4 branch

kevinburke1
authored and
jbardin
committed
Expose etcd client MaxCallSendMsgSize config

jasons42
authored and
jbardin
committed
Document max_request_bytes config

jasons42
authored and
jbardin
committed
Fix broken link

jasons42
authored and
jbardin
committed