remove [<value>|<index>|<option name>] :: delete the value
Removes the property value. For single-valued properties, this sets the
property back to its default value. For container-type properties, this removes
all the values of that property, or you can specify an argument to remove just
a single item or option. The argument is either a value or index of the item to
remove, or an option name (for properties with named options).
Examples: nmcli ipv4.dns> remove 8.8.8.8
nmcli ipv4.dns> remove 2
nmcli bond.options> remove downdelay