Andrew Zaborowski authored Oct 18, 2018 and Thomas Haller committed Oct 23, 2018

Watch for connection-removed events and delete corresponding IWD network
configs if found.  This mainly changes anything for 802.1X networks
where the deleted NM connections might annoyingly re-appear after a
restart.  For PSK networks though it'll make IWD forget the password
which, until now, would be remembered by IWD even if it was removed or
changed in the NM profile, which is a bug.

This is still fragile because we don't handle "connection-updated"
events so the data->mirror_connection pointer for a known network record
may after some time point to an NMSettingsConnection with a different
SSID or security type and there are corner cases where the IWD-side
profile will not be forgotten.  At least I'm trying to make sure we
don't crash and don't wrongly remove any IWD profile which could also be
annoying for complicated EAP configs.