engine: Enable runOnce to choose a vnc keymap.

Enable the selection of a specified vnc keymap when using runOnce popup window to run a vm.
added a new combobox to the runOnce popup.
tested the webAdmin and user portal web apps.

Change-Id: Id908cbaca9f1b20b4b9868a87a8b21f318a493e6
Bug-Url: https://bugzilla.redhat.com/1031040
Signed-off-by: Kobi Ianko <kobi@redhat.com>