apps.rss: mitigate unbiased branches in metadata handling
apps.rss: mitigate unbiased branches in metadata handling

Demultiplex packets into dedicated queues for tagged/untagged
ipv4/ipv6/other packets to avoid unbiased branches in metadata.add()

snabbco/snabb,eugeneia/snabb,eugeneia/snabb,snabbco/snabb,eugeneia/snabb,eugeneia/snabb,eugeneia/snabb,snabbco/snabb,snabbco/snabb,snabbco/snabb,eugeneia/snabb,eugeneia/snabb,snabbco/snabb,snabbco/snabb,eugeneia/snabb,snabbco/snabb