Support for zero capacity nodes

[ikalachy]

Motivation:

Explain here the context, and why you're making that change, what is the problem you're trying to solve.

Conformance:

Your commits should be signed and you should have signed the Eclipse Contributor Agreement as explained in https://github.com/eclipse/vert.x/blob/master/CONTRIBUTING.md
Please also make sure you adhere to the code style guidelines: https://github.com/vert-x3/wiki/wiki/Vert.x-code-style-guidelines

[tsegismont]

Thanks for this PR @ikalachy

Regarding tests I can't see where the Vert.x nodes are declared as zero capacity nodes. Can you clarify?

Also, I think it would be best to implement integration tests for zero capacity nodes like we have for vertx-hazelcast, see https://github.com/vert-x3/vertx-hazelcast/tree/master/vertx-hazelcast/src/test/java/io/vertx/spi/cluster/hazelcast/it/litemembers

[tsegismont]

Suggested change

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	<!-- <version>5.0.13.Final</version>-->
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