l3cfg: add addresses during obj sync even if commit is ASSUME

If a connection is configured to use dhcp4 and NetworkManager service is
restarted before the IPv4 address is configured on the interface,
the connection will fail during the activation because the address is
missing.

This will modify the meaning of assume because it will be more
intrusive. Anyway, ASSUME still makes sense because the commit type is
the lease intrusive.
56 jobs for ff/wait-online in 31 minutes and 22 seconds (queued for 5 seconds)
latest