This commit address a problem in static mode, if the hostname change,
`host.name` value with change too. And as a result:
results['dns_config_result'][host.name]
will be initialized.
We now record the initial hostname first, and uses it as the key for the
results.
This commit also ensures hostname and search domain change are detected if
`instance.dnsConfig.dhcp` is true.
Finally, if we target a cluster, the `changed` result will depend on the
number of nodes.
* Restore module vmware_dns_config
* Remove domainname and change_hostname_to
* Changed version_added from 2.10 to '2.10'
* Add setup_attach_host: true to test case
* Add 'vcsim is not defined' block to integration tests
* Change 'result' to 'dns_config_result'
* Bugfix: Changing some static configurations while keeping others can crash the module
* Implement changing DNS config from DHCP to static on a cluster
* Update documentation for vmware_host_dns
* vmware_host_dns integration tests: Always revert to original DNS configuration, even if a test fails
* Deprecate vmware_dns_config
