Allow clients to connect to multiple servers

[steveatinfincia]

The server code is already capable of accepting multiple clients, and the client code could connect to more than one server if it were modified to spawn multiple greenlets with the NetRNGClient.stream() method as the target.

Goal would be either to allow clients to connect and retrieve entropy from multiple servers at the same time (can only help, not hurt), or allow clients to have a sort of failover capability if their current server disappears.

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[steveatinfincia]

As of 0fa61f0 this technically works, though it's purely a result of zeroconf automatically spawning a greenlet in the client for every available NetRNG server it learns about.

Configuring the client to use a specific server is still limited to a single address.