VMware: new module: vmware_host_powerstate (#36577)

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

test/integration/targets/vmware_host_powerstate/aliases

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+cloud/vcenter
+unsupported

test/integration/targets/vmware_host_powerstate/tasks/main.yml

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+# Test code for the vmware_host_powerstate module.
+# Copyright: (c) 2018, Abhijeet Kasurde <akasurde@redhat.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+# TODO: vcsim does not support Powerstate related to operations
+- name: store the vcenter container ip
+  set_fact:
+    vcsim: "{{ lookup('env', 'vcenter_host') }}"
+
+- debug: var=vcsim
+
+- name: Wait for Flask controller to come up online
+  wait_for:
+    host: "{{ vcsim }}"
+    port: 5000
+    state: started
+
+- name: kill vcsim
+  uri:
+    url: http://{{ vcsim }}:5000/killall
+
+- name: start vcsim
+  uri:
+    url: http://{{ vcsim }}:5000/spawn?cluster=2
+  register: vcsim_instance
+
+- debug:
+    var: vcsim_instance
+
+- name: Wait for vcsim server to come up online
+  wait_for:
+    host: "{{ vcsim }}"
+    port: 443
+    state: started
+
+- name: get a list of hosts from vcsim
+  uri:
+    url: http://{{ vcsim }}:5000/govc_find?filter=H
+  register: hosts
+
+- name: get a host
+  set_fact:
+    host1: "{{ hosts.json[0] | basename }}"
+
+- debug: var=host1
+
+- name: Restart Host
+  vmware_host_powerstate:
+    hostname: "{{ vcsim }}"
+    username: "{{ vcsim_instance.json.username }}"
+    password: "{{ vcsim_instance.json.password }}"
+    validate_certs: False
+    state: power-down-to-standby
+    esxi_hostname: "{{ host1 }}"
+    force: True
+  register: host_powerstate
+
+- debug: var=host_powerstate
+
+- assert:
+    that:
+      - host_powerstate.results is changed