CLIENT LIST cmd

[kakdeykaushik]

resolves #1134

[kakdeykaushik]

@JyotinderSingh this is inital version of changes, have a look and let me know if any code structure changes are required.

I have created a slice of clients which contains all the clients connected to the resp server.
Ideally this slice should reside in iothread package itself. And evalClient fn (eval package) should import it, but this would not work since current dependency chart looks like this and importing iothread package in eval package creates circular dependency.

flowchart TD
    A[server] --> B("iothread
    IOThread interface
    BaseIOThread struct
    ")
    B --> C(ops)
    C -->D(comm)
    C --> E(cmd)
    C -->F("eval
    EvalResponse")


    B --> Z(shard)
    Z --> C
    Z --> F
  

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My solution - I have pulled out IOThread interface out in a new global package(we can think of a better name) and kept the slice of clients in eval package.

This solution works but I think this is not the ideal way to do it. I'd like your suggestions here.