Vendor option containers are incorrectly appended
Both v4 DHO_VIVSO_SUBOPTIONS (125) and v6 D6O_VENDOR_OPTS (17) are incorrectly handled in appendRequestedOptions: these methods append the option from the descriptor but appendRequestedVendorOptions adds suboptions to it so to the option in the configuration. Instead a fresh OptionVendorPtr should be appended.