<!--- Verify first that your feature was not already discussed on GitHub -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
Now "vmware_host_facts" module returns the ESXi version and build number, no update version info, so request getting that info too.
References:
https://www.virtuallyghetto.com/2016/08/quick-tip-how-to-retrieve-the-esxi-update-level-using-the-vsphere-api.html
MOB path:
https://esxi_hostname/mob/?moid=ha-adv-options&doPath=setting%5b%22Misc.HostAgentUpdateLevel%22%5d




##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
vmware_host_facts
##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
Some features of ESXi are introduced in specific ESXi update release, so it's better to get that info and use it as a condition before some tasks. 
<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

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

- config.product.apiVersion
      - overallStatus
  register: host_facts
'''
RETURN = r'''
ansible_facts:
  description: system info about the host machine
  returned: always
  type: dict
  sample:
    {
        "ansible_all_ipv4_addresses": [
            "10.76.33.200"
        ],
        "ansible_bios_date": "2011-01-01T00:00:00+00:00",
        "ansible_bios_version": "0.5.1",
        "ansible_datastore": [
            {
                "free": "11.63 GB",
                "name": "datastore1",
                "total": "12.50 GB"
            }
        ],
        "ansible_distribution": "VMware ESXi",
        "ansible_distribution_build": "4887370",
        "ansible_distribution_version": "6.5.0",
        "ansible_hostname": "10.76.33.100",
        "ansible_in_maintenance_mode": true,
        "ansible_interfaces": [
            "vmk0"