cli: show progress in --pretty mode for 'nmcli con up'
We need to use a workaround for VPN connection state. There is a bug somewhere causing that vpn-state-changed signal is not issued on active VPN connection. Debugging showed that D-Bus PropertiesChanged and VpnStateChanged signals are not processed properly. That's why libnm-glib's VPN connection object is not updated. The issue may lie in libnm-glib or even in dbus-glib. I wasn't able to get VpnStateChanged signal via dbus-glib (dbus_g_proxy_add_signal() and dbus_g_proxy_connect_signal()), however received the signal successfully using GDBus. Until the issue is analyzed and fixed, we need to ask for VPN state of active VPN connection every second in order to show progress and exit correctly.
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