networkd: fix vm interface context

network/files/systemd/vm_interface.network.j2

@@ -11,9 +11,9 @@ Address={{ address }}
 [Route]
 Destination=0.0.0.0/0
 Gateway=169.254.42.1
-PreferredSource={{ canonical_ip_4 }}
+PreferredSource={{ salt['pillar.get']('canonical_ip_4') }}
 
 [Route]
 Destination=::/0
 Gateway=fe80::42:1
-PreferredSource={{ canonical_ip_6 }}
+PreferredSource={{ salt['pillar.get']('canonical_ip_6') }}