Undertow mod_cluster CLI: proxy: Display node's Aliases

As a follow up to JBEAP-215, this bug report is a member of a series addressing crucial CLI management capabilities.

Display node's Aliases

At the moment, this is all there is to see:

"balancer" => {
    "qa_balancer" => {"node" => {"worker-2" => {
        "load" => 89,
        "status" => "NODE_UP",
        "context" => {"/clusterbench" => {
            "requests" => 0,
            "status" => "enabled"
        }}
    }}},
...

Call to action

We need to display node's aliases, e.g.

Aliases:
  karm.brq.redhat.com
  localhost
  default-host

(an example from the current Apache HTTP Server mod_manager implementation)

Blocker priority justification: Numerous Aliases are fundamental to common user environments and they are necessary for several crucial test scenarios. Without this information available via CLI, it would be impossible to manage any Aliases sensitive setup.