<!--- 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 -->

facts = dict()
        facts['ansible_datastore'] = []
        for store in self.host.datastore:
            _tmp = {
                'name': store.summary.name,
                'total': bytes_to_human(store.summary.capacity),
                'free': bytes_to_human(store.summary.freeSpace),
            }
            facts['ansible_datastore'].append(_tmp)
        return facts
    def get_network_facts(self):
        facts = dict()
        facts['ansible_interfaces'] = []
        facts['ansible_all_ipv4_addresses'] = []
        for nic in self.host.config.network.vnic:
            device = nic.device
            facts['ansible_interfaces'].append(device)
            facts['ansible_all_ipv4_addresses'].append(nic.spec.ip.ipAddress)
            _tmp = {
                'device': device,
                'ipv4': {
                    'address': nic.spec.ip.ipAddress,
                    'netmask': nic.spec.ip.subnetMask,
                },
                'macaddress': nic.spec.mac,
                'mtu': nic.spec.mtu,
            }
            facts['ansible_' + device] = _tmp
        return facts
    def get_system_facts(self):