Add SCS recommended flavors (part 2)

[berendt]

https://docs.scs.community/standards/scs-0103-v1-standard-flavors/#recommended-part-2

  - name: SCS-8V-64
    cpus: 8
    ram: 65536
    disk: 0
    scs:cpu-type: shared-core
    scs:disk0-type: network
    scs:name-v1: SCS-8V:64
    scs:name-v2: SCS-8V-64
    hw_rng:allowed: "True"
  - name: SCS-16V-64
    cpus: 16
    ram: 65536
    disk: 0
    scs:cpu-type: shared-core
    scs:disk0-type: network
    scs:name-v1: SCS-16V:64
    scs:name-v2: SCS-16V-64
    hw_rng:allowed: "True"
  - name: SCS-16V-128
    cpus: 16
    ram: 131072
    disk: 0
    scs:cpu-type: shared-core
    scs:disk0-type: network
    scs:name-v1: SCS-16V:128
    scs:name-v2: SCS-16V-128
    hw_rng:allowed: "True"