virt: Fix domain filtering option

virt: Fix domain filtering option

Previously all domains were visible even if certain domains
should be filtered (only block devices and interface devices
were filtered instead of entire domains)
Now entire domains are filtered - if domain should be filtered
out, then it won't be visible the same way as filtered
block devices and network interfaces.

Change-Id: Ib4e50ad32fd94c900c3e83353d28ae06cbfdb442
Signed-off-by: Radoslaw Jablonski <radoslawx.jablonski@intel.com>