fix(drivers): attach_port always uses type='network' too

Same issue as create_machine's boot port: attach_port() used
self._spec.network_type as the raw libvirt interface type, treating
port.source as a literal host bridge device. port.source is always
the logical libvirt network name the orchestrator tracks (e.g.
"exordos-core-net") - on a bridge-type hypervisor that name must be
resolved through a local libvirt network forwarding onto the real
bridge, not used directly as a bridge device name.

Author: VasilyStepanov

exordos_core/compute/pool/drivers/libvirt.py

@@ -1198,8 +1198,13 @@ def attach_port(self, machine: models.Machine, port: models.Port) -> None:
             raise
 
         # Build interface XML
+        # Always type='network': `port.source` is the logical libvirt
+        # network name the orchestrator tracks (see create_machine), not
+        # necessarily a literal host bridge device - a bridge-type
+        # hypervisor still needs it resolved through a local libvirt
+        # network that forwards onto the real bridge.
         interface_xml = XMLLibvirtInstance.interface_xml(
-            iface_type=self._spec.network_type,
+            iface_type="network",
             mac=port.mac,
             rom=self._spec.iface_rom_file,
             mtu=self._spec.iface_mtu,
@@ -1298,12 +1303,11 @@ def create_machine(
                 mac=port.mac,
                 rom=self._spec.iface_rom_file,
                 mtu=self._spec.iface_mtu,
-                # The port a machine is created with is always the transient
-                # boot network (see pool.py's MetaMachine.dump_to_dp), which
-                # is always a plain libvirt virtual network - never the
-                # hypervisor's own (possibly bridge-type) main network. The
-                # real port replaces it later via attach_port(), which does
-                # use self._spec.network_type.
+                # Always type='network': `port.source` is a logical
+                # libvirt network name the orchestrator tracks (the boot
+                # network at initial creation, or the main network when
+                # recreate_machine() rebuilds the domain post-flash), not
+                # necessarily a literal host bridge device.
                 iface_type="network",
                 source=port.source,
             )