FEATURE: Ansible module to manage Stacki hosts

[caladd]

An Ansible module for adding, editing, and removing Stacki hosts.

The module takes these parameters:

`name` - The name of the host to manage
`appliance` - The appliance used for the host
`box` - The box used for the host
`comment` - Freeform text to attach to the host
`environment` - Environment to assign the host
`groups` - List of groups to add or remove the host from. Each item has parameters:
    `name` - The name of the group
    `state` - If present, then a host will be added to this group.If absent, then the host will be removed from this group.
`installaction` - The install boot action for the host
`interfaces` - List of network interfaces for the host. Each item has parameters:
    `channel` - Channel for this interface
    `default` - Is the interface is the default for the hosts
    `interface` - Device for this interface
    `ip` - IP address for this interface
    `name` - Logical name for this interface
    `network` - Network attached to this interface
    `mac` - Hardware MAC address for this interface
    `module` - Device module for this interface
    `options` - Module options for this interface
    `vlan` - The VLAN ID for this interface
    `state` - If present, then an interface will be added to the host, if needed, and options updates. If absent, then the interface will be removed from the host. If update_mac, then the interface device is used to update the mac. If update_interface, then the mac is used to update the interface device. Note: The interface device and mac are both used to match for updating an existing interface.
`osaction` - The os boot action for the host
`rack` - By convention, the number of the rack where the host is located
`rank` - By convention, the position of the host in the rack
`state` - If present, then a host will be added (if needed) and options are set to match. If absent, then the host will be removed.

Example playbook:

---
- hosts: localhost
  tasks:
    - name: Add a host
      stacki_host:
        name: test-backend
        appliance: backend
        box: default
        comment: "test host"
        groups:
          - name: test
        installaction: console
        interfaces:
          - default: true
            interface: eth0
            ip: "10.10.10.10"
            mac: "00:11:22:33:44:55"
        rack: "10"
        rank: "4"
      register: result

    - name: Add host output
      debug:
        var: result

    - name: Modify a host
      stacki_host:
        name: test-backend
        groups:
          - name: test
            state: absent
        installaction: default
        interfaces:
          - interface: eth0
            state: absent
          - interface: eth1
            ip: "10.10.2.1"
            mac: "11:22:33:44:55:66"
        rack: "0"
        rank: "0"
      register: result

    - name: Modify host output
      debug:
        var: result

    - name: Remove a host
      stacki_host:
        name: test-backend
        state: absent
      register: result

    - name: Remove host output
      debug:
        var: result

Output of the debug commands, showing the structure of the data returned:

TASK [Add host output] **************************************************************************
ok: [localhost] => {
    "result": {
        "changed": true,
        "failed": false
    }
}

TASK [Modify host output] ***********************************************************************
ok: [localhost] => {
    "result": {
        "changed": true,
        "failed": false
    }
}

TASK [Remove host output] ***********************************************************************
ok: [localhost] => {
    "result": {
        "changed": true,
        "failed": false
    }
}