Restore getpass.getpass turning off echo in JLine

Approximately around r7116 with the console refactoring the attribute
for getting the console from sys was changed to sys._jy_console, but
not updated in the getpass module. Unfortunately we do not at this
time have testing for such interactive usage, so this was just
reported via email on
http://sourceforge.net/p/jython/mailman/message/33103064/