Special case of util.pair. Used to parse root password options in the form of
old:oldRootPassword,new:newRootPassword
Since passwords can contain any character, a delimiter is difficult to find.
Compromise by looking for ',new:' as a delimeter
function (passwordsValue) {
                const set = passwordsValue.split(',new:');

                if (set.length === 2) {
                    rootPasswords.old = set[0].split('old:')[1];
                    rootPasswords.new = set[1];
                }
            }