I have made a patch to apply several new patch file in nova-compute,
see https://review.openstack.org/#/c/430030/, but these patch files
are based on newton or ocata, for vif hotplug, the attach_interface
API changed, there is a new parameter added after mitaka, see
https://review.openstack.org/#/c/147126/, so this patch is to remove
parameter context so it can be compatible with mitaka
Change-Id: I7f767c21d87d61c13ba5d272f869628210dc5d02