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##### SUMMARY
<!--- Explain the problem briefly below -->
Since commit df581eb ovirt_vm is unable to find a template shared among multiple clusters in the same datacenter. Moreover, the document says that `cluster` parameter is a parameter used to define where VMs will be created. Then it should not be used to filter a template search which is not related to VM storage.

##### 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
2.8.2
```

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

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->


##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
In RHEVM:
1. Create a cluster `cluster_a` and add a template `template_a` in this cluster
2. Create a cluster `cluster_b`

<!--- Paste example playbooks or commands between quotes below -->
```yaml

- name: Provision machine
  ovirt_vm:
    ...
    cluster: "cluster_b"
    template: "template_a"
    ...
```

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##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
The template should be found (Behaviour before commit df581eb)

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
It raises an error

<!--- Paste verbatim command output between quotes -->
```paste below
Template with name 'template_a' and version 'None' in cluster 'cluster_b' was not found
```

if self.param('snapshot_vm') is None:
            return None
        if self.param('snapshot_name') is None:
            return None
        vms_service = self._connection.system_service().vms_service()
        vm_id = get_id_by_name(vms_service, self.param('snapshot_vm'))
        vm_service = vms_service.vm_service(vm_id)
        snaps_service = vm_service.snapshots_service()
        snaps = snaps_service.list()
        snap = next(
            (s for s in snaps if s.description == self.param('snapshot_name')),
            None
        )
        return snap
    def __get_cluster(self):
        if self.param('cluster') is not None:
            return self.param('cluster')
        elif self.param('snapshot_name') is not None and self.param('snapshot_vm') is not None:
            vms_service = self._connection.system_service().vms_service()
            vm = search_by_name(vms_service, self.param('snapshot_vm'))
            return self._connection.system_service().clusters_service().cluster_service(vm.cluster.id).get().name
    def build_entity(self):