about remove root about moquette HOT 3 CLOSED

@andsel 🙏🙏

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Hi @BEWINDOWEB this change come into play with PR #365 and honestly I don't recall what was the exact reason for the code.

Originally the code was simpler:

if (cnode.containsOnly(clientId)) {
    TNode tnode = new TNode();
    return inode.compareAndSet(cnode, tnode) ? Action.OK : Action.REPEAT;
} else if (cnode.contains(clientId)) {
    CNode updatedCnode = cnode.copy();  

that stated as "if a cnode contains only the clientId we I'm removing then replace it with a tombstone".

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ok, thanks anyway :)

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