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##### 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 -->

- Wei Gao (@woshihaoren)
requirements:
    - python >= 2.6
    - PyVmomi
options:
  esxi_hostname:
    description:
    - ESXi hostname.
    - Host facts about the specified ESXi server will be returned.
    - By specifying this option, you can select which ESXi hostsystem is returned if connecting to a vCenter.
    version_added: 2.8
    type: str
  show_tag:
    description:
    - Tags related to Host are shown if set to C(True).
    default: False
    type: bool
    required: False
    version_added: 2.9
  schema:
    description:
    - Specify the output schema desired.
    - The 'summary' output schema is the legacy output from the module
    - The 'vsphere' output schema is the vSphere API class definition
      which requires pyvmomi>6.7.1
    choices: ['summary', 'vsphere']
    default: 'summary'
    type: str
    version_added: '2.10'
  properties: