SSH2: More multi-factor authentication changes

Previously to do multi-factor authentication you'd have to do this:

$ssh->login($user, 'pass1');
$ssh->login($user, 'pass2');

Now you can do this too:

$ssh->login($user, 'pass1', 'pass2');
SSH2: keyboard-interactive changes

Let's say your SSH server had a two-part keyboard-interactive auth. One prompt is for "Password" and the other is for "Verification code". Previously you'd have to do this:

$ssh->login($username, 'pass1', 'code1');

It'd try password authentication with pass1, fail, then do keyboard-interactive with pass1 and then keyboard-interacitve with code1.

ie. the order in which it tried stuff was dependent on the order it was past to the Net_SSH2 object.  And it'd always try password auth first.

Now you can go straight to keyboard-interactive and mix the order as follows:

$ssh->login($username, array('Password' => 'pass1'), array('Verification code' => 'code1'));