etcdctl: don't ask password twice for etcdctl endpoint health --cluster #9136
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Current etcdctl endpoint health --cluster asks password twice if auth
is enabled. This is because the command creates two client instances:
one for the purpose of checking endpoint health and another for
getting cluster members with MemberList(). The latter client doesn't
need to be authenticated because MemberList() is a public RPC. This
commit makes the client with no authed one.
Fix #9094
/cc @lyddragon @gyuho @hexfusion