BISERVER-9714 - IE8 - Hitting the enter key on the PUC login page should act like clicking on the Login button

What was done:
1) added focus call for popup dialog
2) added onkeyup handler for IE browser
Merge pull request #1307 from kolinus/BISERVER-9714

BISERVER-9714 - IE8 - Hitting the enter key on the PUC login page should...