Correct the spelling across the *entire* tree, including translations,
comments, etc. It's easier that way.

Even the places where it's not exposed to the user, such as tests, so
that we learn how is it spelled correctly.

Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.
And likewise, prefer [ p ] || [ q ] over [ p -o q ].

https://github.com/koalaman/shellcheck/wiki/SC2166

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.

Routing table entries for a device get flushed when the device is
deactivated, but rules table entries don't, so we have to flush them
by hand.

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