Missing package dependancies added.

A missing "config" parameter for qemu-nbd based seeding
method added.

A new seeding method utilising Cloud-init added.
The qemu-nbd based method is still a default method
for backward compatibility.

To enable cloud-init, set the "seed" parameter on
a cluster or node level to "cloud-init".
To disable seeding, set this parameter to "false".
Setting this parameter to "true" will default to
the "qemu-nbd" method.

Salt Minion config file will be created automatically
and may be overrided via cluster or node level
metadata:

  salt:
    control:
      cluster:
        mycluster:
          seed: cloud-init
          cloud_init:
            user_data:
              salt_minion:
                conf:
                  master: 10.1.1.1

or for qemu-nbd case:

  salt:
    control:
      cluster:
        mycluster:
          seed: true
          config:
            host: 10.1.1.1

That may be useful when Salt Master has two IPs in
different networks and one of the networks isn't accessible
from a VM at the moment it's created. Setting a reachable
Salt master IP from metadata helps avoid potential problems.

Also, a liitle optimization has been done to parse/dump
an libvirt XML only once while modifying it.

Change-Id: I091cf409cb43ba2d0a18eaf2a08c11e88d0334e2
Closes-Bug: PROD-22191

Related PROD-23040 (PROD:23040)

Change-Id: I6cf2cb5ff66dcffb1532343a58416fb242703322

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

The conflicting ID is 'libvirt_service' and is found in SLS:
- libvirt.server.service
- salt.control.virt

Change-Id: Ibb0b6f0a574a53f1cb8517a9fe0d7f0febb07bb3

Related bug: PROD-20531

Change-Id: Ia00a4310c5e1ec590ddd9c16b8013e42198632ac

related to bug: PROD-20139

Change-Id: I32fee91f22e0963ec60de63b4c6e020df92f9f3b

Change-Id: I28bbc7a6b5810dfb56b8391a557aecd1fa523385

[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

Change-Id: I6f1292779858c45f9cf6f4caf3657ee000b2cf06

Add ability to specify custom node name in reclass.

Change-Id: I26aeae62cc1c1d407d36d1d6bf101db073d9e610