Display bind/advertise addresses on agent startup

[dadgar]

Sample outputs from demo/vagrant/(server/client1).hcl and nomad agent -dev mode

Server:

==> Nomad agent configuration:

       Advertise Addrs: HTTP: 192.168.1.75:4646; RPC: 192.168.1.75:4647; Serf: 192.168.1.75:4648
            Bind Addrs: HTTP: 0.0.0.0:4646; RPC: 0.0.0.0:4647; Serf: 0.0.0.0:4648
                Client: false
             Log Level: DEBUG
                Region: global (DC: dc1)
                Server: true
               Version: 0.8.4-dev

Client:

==> Nomad agent configuration:

       Advertise Addrs: HTTP: 192.168.1.75:5656
            Bind Addrs: HTTP: 0.0.0.0:5656
                Client: true
             Log Level: DEBUG
                Region: global (DC: dc1)
                Server: false
               Version: 0.8.4-dev

Dev:

==> Nomad agent configuration:

       Advertise Addrs: HTTP: 127.0.0.1:4646; RPC: 127.0.0.1:4647; Serf: 127.0.0.1:4648
            Bind Addrs: HTTP: 127.0.0.1:4646; RPC: 127.0.0.1:4647; Serf: 127.0.0.1:4648
                Client: true
             Log Level: DEBUG
                Region: global (DC: dc1)
                Server: true
               Version: 0.8.4-dev

[chelseakomlo]

Looks good, this should be helpful for visibility/debugging in the future.

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