CP-44103: Ordering network devices (#6381)

This part sorts host network devices in xcp-networkd. Previously, the
ordering was handled by the interface-rename functionality. This will
now be replaced by an equivalent function in xcp-networkd, but without
renaming the network devices. The renmaing performed by the
interface-rename was used to record the sorting result as the name of
the NICs like "eth<N>". Now the sorting result will be recorded as
internal files.

Author: minglumlu

ocaml/networkd/lib/dune

@@ -4,6 +4,7 @@
  (libraries
   astring
   forkexec
+  macaddr
   mtime
   mtime.clock.os
   re
@@ -19,6 +20,7 @@
   xapi-stdext-threads
   xapi-stdext-unix
   xapi-inventory
+  xapi-idl
   xapi-idl.network
   xapi-log
   xapi-open-uri

ocaml/networkd/lib/network_config.ml

@@ -187,6 +187,7 @@ let read_management_conf () =
     ; bridge_config
     ; gateway_interface= Some bridge_name
     ; dns_interface= Some bridge_name
+    ; interface_order= None
     }
   with e ->
     error "Error while trying to read firstboot data: %s\n%s"