clean up / clarify usage of HOST_IP in geth_entrypoint #272
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Previously HOST_IP was defaulting to 0.0.0.0, and being exposed via --nat as an external IP address. This PR makes HOST_IP default to empty, in which case no --nat flag will be used (implying the "any" geth default will be active). Adds a comment that HOST_IP should be set to external IP address and port 30303 opened to improve connectivity, in which case the --nat flag will be set to
extip:$HOST_IP
This potentially explains #222