SUSE First Boot Configuration File Format (SUSE/azure-li-services): Add "directory:" for packages section of YAML file

suse_firstboot_config.yaml

version: 20171115
instance_type: LargeInstance|VeryLargeInstance
blade:
  sku: "SR92"
  cpu: 32
  memory: "20tb"
  time_server: "129.6.15.28"
  networking:
    -
      interface: eth0
      vlan: 10
      ip: 10.250.10.51
      gateway: 10.250.10.1
      subnet_mask: 255.255.255.0
    -
      interface: eth1
      vlan: 51
      ip: 10.250.51.51
      subnet_mask: 255.255.255.0
    -
      interface: eth2
      vlan: 52
      ip: 10.250.52.51
      subnet_mask: 255.255.255.0

  storage:
    -
      file_system: nfs
      min_size:  112G
      device: "10.250.21.12:/nfs/share"
      mount: "/mnt/foo"
      mount_options:
        - a
        - b
        - c

credentials:
  -
    username: hanauser
    shadow_hash: "sha-512-cipher"
    ssh-key: "ssh-rsa foo"
  -
    username: rpc
    id: 495
    group: nogroup
    home_dir: /var/lib/empty

packages:
  repository_name: azure_packages
  directory:
    - "directory-with-rpm-files"
    - "another-directory-with-rpm-files"

call: "path/in/LUN/update.sh"