Don't call the 'if{up,down}-routes' scripts because in next Fedora
versions network scripts will be deprecated and will not be present in
the default installation.
Instead, just copy and adapt the code from those scripts.
https://bugzilla.redhat.com/show_bug.cgi?id=1618419
The main reason to introduce the "no-wait.d" dispatcher directory was
"10-ifcfg-rh-routes.sh", which (as a pre-up script) delays activation.
We even extracted the script to a separate package on RHEL to avoid
delays by default.
Invoke the script via no-wait.d.
If a connection has an associated "rule-NAME" or "rule6-NAME" file,
don't try to read in the routes, since NetworkManager won't be able to
parse them correctly. Instead, log a warning that they will need to be
applied via a dispatcher script, and provide a script that would do
that in examples/dispatcher/.
Tighten up with suggestions from Johannes Buchner and mention
his contribution.
Also fixes operation with current nmcli since it changed from
"802-3-ethernet" -> "ethernet" and thus the script was broken.
https://bugzilla.gnome.org/show_bug.cgi?id=513488
