Added the 'core.tcp_info' command

[karstenjakobsen]

The kamcmd core.tcp_info command will also retrieve some TLS connection stats. This is useful if you need information regarding TCP and TLS connections. Example:

{
    readers: 8
    max_connections: 4096
    max_tls_connections: 4096
    opened_connections: 595
    opened_tls_connections: 595
    write_queued_bytes: 0
}