Description: Treat vlan interfaces as if they steal MAC addresses always
 Add a workaround in interface_has_own_mac() function to always treat
 vlan interfaces as if they have a stolen MAC address, because kernels
 before v4.7 lie about it.
Author: Dimitri John Ledkov <xnox@ubuntu.com>
Bug-Upstream: https://bugs.launchpad.net/cloud-init/+bug/1682871

--- cloud-init-0.7.9-90-g61eb03fe.orig/cloudinit/net/__init__.py
+++ cloud-init-0.7.9-90-g61eb03fe/cloudinit/net/__init__.py
@@ -222,6 +222,10 @@ def interface_has_own_mac(ifname, strict
     assign_type = read_sys_net_int(ifname, "addr_assign_type")
     if strict and assign_type is None:
         raise ValueError("%s had no addr_assign_type.")
+    # <<v4.7 kernels lie that vlan interfaces have addr_assign_type 3
+    uevent = read_sys_net_safe(ifname, 'uevent').splitlines()
+    if not strict and 'DEVTYPE=vlan' in uevent:
+        return False
     return assign_type in (0, 1, 3)