When yum presents the

Is this ok [y/N]:

prompt, it only checks the first character entered.  In my instance, I typed a
y, did something else, then typed n<enter>.  This caused yum to accept my 'yn'
as a y.  I'm attaching a patch against the yum git repo.  I'd file this bug with
upstream, but I cannot use their bugzilla as they won't let anyone create a new
account easily.

The patch makes the user enter 'y', 'n', 'yes', or 'no'.