implement ZBFW zone support

[grotewortel]

Description

Can you please implement the support for ZBFW zones?

Kind regards,
Jan

show running-config class-map github-classmap
This is part of the running config:

zone security some_zone_a
zone security some_zone_b
zone-pair security zone_pair_name source some_zone_a destination some_zone_b
 description from A to B!
 service-policy type inspect some_policymap
!

and also:

interface GigabitEthernet7
 zone-member security internet

json path: .data["Cisco-IOS-XE-native:native"] | .zone, ."zone-pair"
This is the restconf-json formatted running config:

{
  "Cisco-IOS-XE-zone:security": [
    {
      "id": "some_zone_a"
    },
    {
      "id": "some_zone_b"
    }
  ]
}
{
  "Cisco-IOS-XE-zone:security": [
    {
      "id": "zone_pair_name",
      "source": "some_zone_a",
      "destination": "some_zone_b",
      "description": "from A to B!",
      "service-policy": {
        "type": {
          "inspect": "some_policymap"
        }
      }
    }
  ]
}