##### SUMMARY
The following modules throw a `[WARNING]: Found internal 'results' key in module return, renamed to 'ansible_module_results'`:

* [ ]  `vmware_datastore_maintenancemode`
* [ ]  `vmware_host_kernel_manager`
* [ ]  `vmware_host_ntp`
* [ ]  `vmware_host_service_manager`
* [ ]  `vmware_tag`

I've generated the list like this:

`cd lib/ansible/modules/cloud/vmware/ && grep exit_json *.py | grep results= | cut -d ':' -f 1 | cut -d '.' -f 1`

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
vmware

##### ANSIBLE VERSION
`devel`
username: '{{ vcenter_username }}'
    password: '{{ vcenter_password }}'
    datastore_cluster: '{{ datastore_cluster_name }}'
    state: present
  delegate_to: localhost
- name: Exit datastore into Maintenance Mode
  vmware_datastore_maintenancemode:
    hostname: '{{ vcenter_hostname }}'
    username: '{{ vcenter_username }}'
    password: '{{ vcenter_password }}'
    datastore: '{{ datastore_name }}'
    state: absent
  delegate_to: localhost
'''
RETURN = '''
results:
    description: Action taken for datastore
    returned: always
    type: dict
    sample:
'''
try:
    from pyVmomi import vim
except ImportError:
    pass
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.vmware import (PyVmomi, vmware_argument_spec, wait_for_task,
                                         find_cluster_by_name, get_all_objs)
from ansible.module_utils._text import to_native
class VmwareDatastoreMaintenanceMgr(PyVmomi):