frontend: Use GraphicsInfo instead of VmDynamic atts

Starting with this patch, frontend console classes retrieve console data
(port, ip,...) from GraphicsInfo structures instead of simple VmDynamic
attributes.

Change-Id: Iae7d8a7a4b4cdd801ecf3c9c055c8a56aa796286
Signed-off-by: Frantisek Kobzik <fkobzik@redhat.com>
Bug-Url: https://bugzilla.redhat.com/1033547