implementation of WFLY-2510

Add CLI command to display information about current connection.
BTW, I have a couple of simple table implementations (org.jboss.as.cli.util.SimpleTable and StrictSizeTable) where you can add rows and columns (with or without headers) and then format them into a StringBuffer (it'll use column width based on the values provided) and optionally ordering the rows. They are primitive API though. Just in case.