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##### SUMMARY
<!--- Explain the problem briefly below -->
We try to maintain VM's configuration using the ovirt_vm module using a single playbook (that does not change) and a yaml configuration file to describe the VM (that change during the life of the VM).
The VM is created from a template as a clone/independant version. The creation is done with ansible-playbook without error.
But when we try to change an attribute (for example : description) in the yaml configuration file, the execution of the playbook fails.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ovirt_vm

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.9.1
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, Jun 11 2019, 14:33:56) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
Empty output
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
The target is an uptodate RHV installation (version 4.3.6.7).
We tried to use 2 differents hosts to execute the playbook :
- ubuntu 18.04 with ansible and ovirt-engine-sdk-python installed with pip3
- the HostedEngine of RHV : RHEL 7.7 with uptodate versions of ovirt-engine-sdk-python and ansible package

The result is the same in both cases.

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
First execution of the playbook to create the VM :
ansible-playbook template_bug.yaml -e 'vm_file=vm.yaml'

Content of vm.yaml file is :
```yaml
---
vm_name: "TEST-TemplateBug"
vm_template: "SYS-Ubuntu16"
vm_description: "Original description"
```

Second execution of the playbook in order to modify VM description :
Same command but with a different vm.yaml file :
```yaml
---
vm_name: "TEST-TemplateBug"
vm_template: "SYS-Ubuntu16"
vm_description: "New description"
```
Content of the playbook:
<!--- Paste example playbooks or commands between quotes below -->
```yaml
---
# Doc : https://docs.ansible.com/ansible/latest/modules/ovirt_vm_module.html

- name: Template Bug
  hosts: localhost
  connection: local
  gather_facts: false

  vars_files:
    - "rhv_connection.yaml"
    - "{{ vm_file }}"

  vars_prompt:
    - name: rhv_password
      prompt: "Password"
      private: yes

  pre_tasks:
    - name: "RHV connection"
      ovirt_auth:
        url: "{{ rhv_url }}"
        username: "{{ rhv_login }}"
        password: "{{ rhv_password }}"
        ca_file: "{{ rhv_cert }}"
        insecure: false
      tags:
        - always

  tasks:
    - name: "VM {{ vm_name }} creation/modification"
      ovirt_vm:
        auth: "{{ ovirt_auth }}"
        name: "{{ vm_name }}"
        template: "{{ vm_template }}"
        description: "{{ vm_description }}"
        state: present
        clone: yes
        cluster: "{{ rhv_cluster }}"
        
  post_tasks:
    - name: RHV log out
      ovirt_auth:
        state: absent
        ovirt_auth: "{{ ovirt_auth }}"
      tags:
        - always
```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
We expected the modification of description attribute of the VM.

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
The second execution of ansible-playbook failed with error.

<!--- Paste verbatim command output between quotes -->
```paste below
ansible-playbook template_bug.yaml -e 'vm_file=vm.yaml'
Password: 

PLAY [Template Bug] **************************************************************************************************************************************************************************************************************************

TASK [RHV connection] ************************************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [VM TEST-TemplateBug creation/modification] *********************************************************************************************************************************************************************************************
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: Error: Fault reason is "Operation Failed". Fault detail is "[Cannot edit VM. The requested template doesn't belong to the same base template as the original template.]". HTTP response code is 400.
fatal: [localhost]: FAILED! => {"changed": false, "msg": "Fault reason is \"Operation Failed\". Fault detail is \"[Cannot edit VM. The requested template doesn't belong to the same base template as the original template.]\". HTTP response code is 400."}

PLAY RECAP ***********************************************************************************************************************************************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0
```

vm_host = self.param('host')
        vm_service = self._service.vm_service(entity.id)
        
        if entity.status == otypes.VmStatus.UP:
            if vm_host is not None:
                hosts_service = self._connection.system_service().hosts_service()
                current_vm_host = hosts_service.host_service(entity.host.id).get().name
                if vm_host != current_vm_host:
                    if not self._module.check_mode:
                        vm_service.migrate(host=otypes.Host(name=vm_host), force=self.param('force_migrate'))
                        self._wait_for_UP(vm_service)
                    self.changed = True
            elif self.param('migrate'):
                if not self._module.check_mode:
                    vm_service.migrate(force=self.param('force_migrate'))
                    self._wait_for_UP(vm_service)
                self.changed = True
        return entity
    def _wait_for_UP(self, vm_service):
        wait(