handle aggr(4) in the same way as trunk(4)

from brad@
ok bluhm@ claudio@ deraadt@

src/etc/netstart

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: netstart,v 1.200 2018/08/29 11:30:48 krw Exp $
+#	$OpenBSD: netstart,v 1.201 2019/10/25 06:01:27 dlg Exp $
 
 # Turn off Strict Bourne shell mode.
 set +o sh
@@ -300,12 +300,12 @@ vifscreate
 
 # Configure all the non-loopback interfaces which we know about, but
 # do not start interfaces which must be delayed. Refer to hostname.if(5)
-ifmstart "" "trunk svlan vlan carp pppoe tun tap gif etherip gre egre mobileip pflow"
+ifmstart "" "aggr trunk svlan vlan carp pppoe tun tap gif etherip gre egre mobileip pflow"
 
-# The trunk interfaces need to come up first in this list.
+# The aggr and trunk interfaces need to come up first in this list.
 # The (s)vlan interfaces need to come up after trunk.
 # Configure all the carp interfaces which we know about before default route.
-ifmstart "trunk svlan vlan carp pppoe"
+ifmstart "aggr trunk svlan vlan carp pppoe"
 
 # Set default routes for IPv4 and IPv6.
 defaultroute