cli: allow modifying multiple properties by 'nmcli con modify'
This is necessary especially for cases where properties depend on each other. So you need to set them in one command, else the profile won't validate. Examples: nmcli con mod em1-1 ipv4.method manual ipv4.addr "192.168.1.2/24,10.10.1.5/8" nmcli con mod profile ipv4.method link-local ipv4.addr ""
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