##### 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

search_spec = vim.host.DatastoreBrowser.SearchSpec(
            details=detail_query,
            matchPattern=[vmdk_filename],
            searchCaseInsensitive=True,
        )
        search_res = browser.SearchSubFolders(
            datastorePath=datastore_name_sq,
            searchSpec=search_spec
        )
        changed = False
        vmdk_path = datastore_name_sq + " " + vmdk_fullpath
        try:
            changed, result = wait_for_task(search_res)
        except TaskError as task_e:
            self.module.fail_json(msg=to_native(task_e))
        if not changed:
            self.module.fail_json(msg="No valid disk vmdk image found for path %s" % vmdk_path)
        target_folder_paths = [
            datastore_name_sq + " " + vmdk_folder + '/',
            datastore_name_sq + " " + vmdk_folder,
        ]
        for file_result in search_res.info.result:
            for f in getattr(file_result, 'file'):
                if f.path == vmdk_filename and file_result.folderPath in target_folder_paths:
                    return f
        self.module.fail_json(msg="No vmdk file found for path specified [%s]" % vmdk_path)
    #
    
    #
    def _deepmerge(self, d, u):