Spawning AArch64 VMs using salt.control.virt requires a few extra
domain configuration items to be configurable:
- libvirt xml: pass loader param to vm
  Based on upstream commit [1].
- libvirt xml: pass virt machine type
- libvirt xml: pass cpu mode to vm
- virt module: Allow NVRAM unlinking on DOM undefine
  UEFI-enabled VMs usually have pflash (NVRAM) devices attached,
  which require one additional libvirt flag to be passed at 'undefine'.
  This is usually the case for AArch64 (arm64) VMs, where AAVMF (AA64
  UEFI) is the only supported guest bootloader.

[1] https://github.com/saltstack/salt/commit/9cace9adb

Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

This patchset obsoletes switching from "dhcp" to "static" during
deployment.

Example pillars:
salt:
  control:
    enabled: true
    virt_enabled: true
    size:
      small:
        cpu: 1
        ram: 1
    cluster:
      infra:
        domain: example.com
        engine: virt
        config:
          engine: salt
          host: master.domain.com
        cloud_init:
          network_data:
            links:
            - id: ens2
              name: ens2
              type: phy
          user_data:
            disable_ec2_metadata: true
            resize_rootfs: True
            timezone: UTC
            ssh_deletekeys: True
            ssh_genkeytypes: ['rsa', 'dsa', 'ecdsa']
            ssh_svcname: ssh
            locale: en_US.UTF-8
            disable_root: true
            apt_preserve_sources_list: false
            apt:
              sources_list: ""
              sources:
                ubuntu.list:
                  source: ${linux:system:repo:ubuntu:source}
                mcp_saltstack.list:
                  source: ${linux:system:repo:mcp_saltstack:source}
        node:
          ctl01:
            provider: kvm01.example.com
            image: ubuntu-16.04.qcow2
            size: small
            cloud_init:
              network_data:
                networks:
                - id: private-ipv4
                  ip_address: 192.168.0.161
                  link: ens2
                  netmask: 255.255.255.0
                  routes:
                  - gateway: 192.168.0.1
                    netmask: 0.0.0.0
                    network: 0.0.0.0
                  type: ipv4

Change-Id: I087518404c61e0bab2303e40957bacca94692102

Prod-Related: PROD-20747

Change-Id: Id7822963ab45ff7db3252f5329a9376aa4bf10d6

[Fix] Doc

Issue: - It is not possible to pass [R]andom [N]umber [G]enerator
         device to libvirt guest xml in order to control entropy.

       - Doc has no information on how to provision vms using salt

Solution: - Pass rng parameters via kwargs from node: pillar
            Attach rng xml object to generated xml.

          - Provide with an example

Prod-Related: PROD-19214
Customer-Found
Change-Id: Iea111f2d927edf46f06bb7ccfad06d37b752fba9

Change-Id: I685de4207f1f7f17264cc4ad2d81c3348ca20074

Example:

parameters:
  salt:
    control:
      size: #RAM 4096,8192,16384,32768,65536
        openstack.control:
          cpu: 8
          ram: 32768
          disk_profile: small_two_disks
          net_profile: default

  virt:
    disk:
      small_two_disks:
        - system:
            size: 50000
            image: http:/path/to/image.qcow2
        - cinder-volume:
            size: 50000

Change-Id: Ie092b77627cb2b1d36ba4b7a2a7d749ad91881c8