Use unique names Network Domains and VLANs in acceptance tests

[tintoy]

Use the random resource type to add a numeric suffix to the names. Modify verification functions to take account of this.

• Data sources
  • ddcloud_networkdomain
  • ddcloud_vlan
• Resources
  • ddcloud_networkdomain
  • ddcloud_vlan
  • ddcloud_server
  • ddcloud_firewall_rule
  • ddcloud_address_list
  • ddcloud_port_list
  • ddcloud_nat
  • ddcloud_server_anti_affinity
  • ddcloud_vip_node
  • ddcloud_vip_pool
  • ddcloud_vip_pool_member
  • ddcloud_virtual_listener
  • ddcloud_ip_address_reservation