libnm: export interface flags

Add libnm support for the new InterfaceFlags property of NMDevice.

examples/python/gi/get-interface-flags.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2019 Red Hat, Inc.
+#
+
+import gi
+gi.require_version('NM', '1.0')
+from gi.repository import GLib, NM
+
+if __name__ == "__main__":
+    client = NM.Client.new(None)
+    devices = client.get_devices()
+
+    for d in devices:
+        print("{:<16} {:<16} {}".format(d.get_iface(),
+                                        "(" + d.get_type_description() + ")",
+                                        NM.utils_enum_to_str(NM.DeviceInterfaceFlags,
+                                                             d.get_interface_flags())))