##### SUMMARY

The following snippet from https://github.com/ansible/ansible/blob/devel/test/integration/targets/vmware_guest/tasks/create_d1_c1_f0.yml uses `autoselect_datastore: True`.

```yaml
- name: create new VMs
  vmware_guest:
    validate_certs: False
    hostname: "{{ vcenter_hostname }}"
    username: "{{ vcenter_username }}"
    password: "{{ vcenter_password }}"
    name: newvm_1
    #template: "{{ item|basename }}"
    guest_id: centos64Guest
    datacenter: "{{ dc1 }}"
    hardware:
        num_cpus: 1
        num_cpu_cores_per_socket: 1
        memory_mb: 256
        hotadd_memory: true
        hotadd_cpu: false
        max_connections: 10
    disk:
        - size: 1gb
          type: thin
          autoselect_datastore: True
    state: poweredoff
    folder: F0
```

One of my two datastores is dedicated to the ISO image and so, is readOnly. But it still get selected consistently. I use the following hack to avoid the problem:

```diff
diff --git a/lib/ansible/modules/cloud/vmware/vmware_guest.py b/lib/ansible/modules/cloud/vmware/vmware_guest.py
index 6a63e97798..3648e3e87f 100644
--- a/lib/ansible/modules/cloud/vmware/vmware_guest.py
+++ b/lib/ansible/modules/cloud/vmware/vmware_guest.py
@@ -1925,6 +1925,15 @@ class PyVmomiHelper(PyVmomi):
 
                 datastore_freespace = 0
                 for ds in datastores:
+                    is_readonly = False
+                    for h in ds.host:
+                        if h.mountInfo.accessMode == 'readOnly':
+                            is_readonly = True
+                            break
+
+                    if is_readonly:
+                        continue
+
                     if (ds.summary.freeSpace > datastore_freespace) or (ds.summary.freeSpace == datastore_freespace and not datastore):
                         # If datastore field is provided, filter destination datastores
                         if 'datastore' in self.params['disk'][0] and \
```
<!--- Explain the problem briefly below -->

##### ISSUE TYPE
- Bug Report

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

vmware_guest

datastore_cluster = self.cache.find_obj(self.content, [vim.StoragePod], datastore_name)
                if datastore_cluster:
                    
                    datastore_name = self.get_recommended_datastore(datastore_cluster_obj=datastore_cluster)
                
                datastore = self.cache.find_obj(self.content, [vim.Datastore], datastore_name)
            else:
                self.module.fail_json(msg="Either datastore or autoselect_datastore should be provided to select datastore")
        if not datastore and self.params['template']:
            
            disks = [x for x in vm_obj.config.hardware.device if isinstance(x, vim.vm.device.VirtualDisk)]
            if disks:
                datastore = disks[0].backing.datastore
                datastore_name = datastore.name
            
            if datastore:
                dc = self.cache.get_parent_datacenter(datastore)
                if dc.name != self.params['datacenter']:
                    datastore = self.autoselect_datastore()
                    datastore_name = datastore.name
        if not datastore:
            if len(self.params['disk']) != 0 or self.params['template'] is None:
                self.module.fail_json(msg="Unable to find the datastore with given parameters."
                                          " This could mean, %s is a non-existent virtual machine and module tried to"
                                          " deploy it as new virtual machine with no disk. Please specify disks parameter"
                                          " or specify template to clone from." % self.params['name'])
            self.module.fail_json(msg="Failed to find a matching datastore")
        return datastore, datastore_name
    def obj_has_parent(self, obj, parent):