examples: add simply python GObject Introspection example

Unfortunately since libnm-glib/libnm-util make heavy use of
GHashTable and GValue, functions that deal with these types
can't be used from Python when using GObject Introspection,
since pygobject can't handle conversion between python types
and GValue/GHashTable very well.  You'll likely encounter
assertions like:

ERROR:pygi-argument.c:1755:_pygi_argument_to_object: assertion failed: (g_type_info_get_tag (key_type_info) != GI_TYPE_TAG_VOID)
Aborted

examples/python/goi-list-connections.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+# -*- Mode: Python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Copyright (C) 2012 Red Hat, Inc.
+#
+
+from gi.repository import GObject, NetworkManager, NMClient
+
+# This example asks settings service for all configured connections.
+# Unfortunately, at this time since libnm-glib still makes heavy use of
+# GValue and GHashTable (rather than GVariant), libnm-glib isn't fully
+# usable from GObject Introspection-ready languages.  Most functions will
+# work fine, but those involving connection secrets (like
+# nm_remote_connection_get_secrets() or nm_connection_to_hash()) cause assertion
+# failures since pygobject cannot handle complex GHashTable elements.
+
+main_loop = None
+
+def print_values(setting, key, value, flags, data):
+    print "  %s.%s: %s" % (setting.get_name(), key, value)
+
+def connections_read(settings):
+    connections = settings.list_connections()
+    for c in connections:
+        print "--- %s : %s" % (c.get_id(), c.get_path())
+        c.for_each_setting_value(print_values, None)
+        print "\n"
+    main_loop.quit()    
+
+if __name__ == "__main__":
+    main_loop = GObject.MainLoop()
+    settings = NMClient.RemoteSettings.new(None);
+
+    # connections are read asynchronously, so we need to wait for the
+    # settings object to tell us that it's read all connections
+    settings.connect("connections-read", connections_read)
+    main_loop.run()
+