core: remove vmType related logic

remove logic that based on vmType,
add parameter to determine sound card creation.
keep old logic if parameter is null for backward compatibility.

on import, create sound device only if absent and imported from old
cluster.

Change-Id: I53d6e5bbd66c4d67ec37326b545b65f086600169
Signed-off-by: Omer Frenkel <ofrenkel@redhat.com>