Description of problem:
When user removes label from host's network interface, also network is removed.

Version-Release number of selected component (if applicable):
ansible-2.5.0-2.fc27.noarch
ovirt-engine-4.2.3-0.1.el7.noarch

How reproducible: always


Steps to Reproduce:
1. create dummy_1 interface on host, create test_network in engine
2. assign network and add label to interface

---
- hosts:
    - engine
  tasks:
    - name: Add VM Networks
      ovirt_host_networks:
        auth: "{{ ansible_auth }}"
        name: "vhost05"
        interface: dummy_1
        networks:
          - name: test_network
        labels:
          - INT
        check: true
        save: true

3. label and network added, see in admin portal hosts detail -> Network interfaces -> Setup Host Networks
4. remove the label

---
- hosts:
    - engine
  tasks:
    - name: Remove label
      ovirt_host_networks:
        auth: "{{ ansible_auth }}"
        name: "vhost05"
        interface: dummy_1
        labels:
          - INT
        check: true
        save: true
        state: absent


Actual results: label and network are removed from the interface


Expected results: only label is removed, network stays assigned to interface dummy_1