##### 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

""" Get a resource pool, filter on cluster, esxi_hostname or resource_pool if given """
        cluster_name = cluster or self.params.get('cluster', None)
        host_name = host or self.params.get('esxi_hostname', None)
        resource_pool_name = resource_pool or self.params.get('resource_pool', None)
        
        datacenter = find_obj(self.content, [vim.Datacenter], self.params['datacenter'])
        if not datacenter:
            self.module.fail_json(msg='Unable to find datacenter "%s"' % self.params['datacenter'])
        
        if cluster_name:
            cluster = find_obj(self.content, [vim.ComputeResource], cluster_name, folder=datacenter)
            if not cluster:
                self.module.fail_json(msg='Unable to find cluster "%s"' % cluster_name)
        
        elif host_name:
            host = find_obj(self.content, [vim.HostSystem], host_name, folder=datacenter)
            if not host:
                self.module.fail_json(msg='Unable to find host "%s"' % host_name)
            cluster = host.parent
        else:
            cluster = None
        
        resource_pool = find_obj(self.content, [vim.ResourcePool], resource_pool_name, folder=cluster or datacenter)
        if not resource_pool:
            if resource_pool_name:
                self.module.fail_json(msg='Unable to find resource_pool "%s"' % resource_pool_name)
            else:
                self.module.fail_json(msg='Unable to find resource pool, need esxi_hostname, resource_pool, or cluster')
        return resource_pool
    def deploy_vm(self):