This adds a global "--offline" option and allows its use with "add" and
"modify" commands. The "add" looks like this:
$ nmcli --offline conn add type ethernet ens3 ipv4.dns 192.168.1.1 \
>output.nmconnection
The "modify" is essentially implementing what's been suggested by
Beniamino in bugzilla ticked (referred to below):
$ nmcli --offline connection modify ens3 ipv4.dns 192.168.1.1 \
<input.nmconnection >output.nmconnection
Other commands don't support the argument at the moment:
$ nmcli --offline c up ens3
Error: 'up' command doesn't support --offline mode.
https://bugzilla.redhat.com/show_bug.cgi?id=1361145
6fa1323ce5