Designate a primary meta node when multiple meta node exists

[Vonng]

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If there are multiple meta nodes, we have to provide a way to designate one as the primary meta node.

It is reasonable to use the CURRENT node as the primary meta node.

The rough idea is to introduce a new variable meta_ip which points to the current node by default.

Which plays the part of the default placeholder 10.10.10.10

So we can replace those hard-coded 10.10.10.10 with meta_ip too, and make it much more elegant and convenient.

We may also need some templating or special logical to handle that too.