examples: group python examples - dbus vs. gi

Move examples using dbus-python ('dbus' module) and GObject introspection into
their own directories.

examples/python/Makefile.am

@@ -1,14 +1,2 @@
-EXTRA_DIST = \
-	nm-state.py \
-	add-connection.py \
-	add-system-wifi-connection.py
-	vpn.py \
-	update-secrets.py \
-	list-connections.py \
-	show-bssids.py \
-	disconnect-device.py \
-	get-active-connection-uuids.py \
-	list-devices.py \
-	goi-list-connections.py \
-	goi-device-state-ip4config.py \
-	goi-firewall-zone.py
+SUBDIRS= dbus gi
+