NMSettings (and NMConnectionProvider) had a signal to indicate when it
had loaded the connections, but in reality this always happened before
nm_settings_new() returned (as a side effect of calling
unmanaged_specs_changed()) and so no one else would ever actually see
the signal. So just kill it.
Plugin owns the object and callers must reference it if they wish to use it outside
of the function they called "add" from. Likewise, callers of the ConnectionProvider's
add_connection method must also reference the returned object if they wish to
continue using it.
This method returns true, if the connections are already loaded (and the
connection_loaded signal already emited).
Signed-off-by: Thomas Haller <thaller@redhat.com>
