Enable host-passthrough for virt control plane

PROD-36510

Change-Id: Iba943e4708c1c905e899671d0afcafc472565e75
diff --git a/defaults/salt/init.yml b/defaults/salt/init.yml
index 0b80c35..a76e70e 100644
--- a/defaults/salt/init.yml
+++ b/defaults/salt/init.yml
@@ -58,3 +58,4 @@
 
     salt_minion_ca_authority: salt_master_ca
     salt_master_api_bind_address: 0.0.0.0
+    salt_control_cluster_qemu_cpu_model: host-passthrough