RFR(xs) 8162255: Alt-Enter v/Alt-Enter i not working on some terminals

[Jan Lahoda]

Hi,

ConsoleIOContext currently contains a code sequence for Alt-Enter.
Some terminals appear to send a different code sequence for the 
shortcut. So I propose to add this code sequence to ConsoleIOContext as 
well.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8162255

Webrev:
http://cr.openjdk.java.net/~jlahoda/8162255/webrev.00/

Thanks for any feedback,
     Jan