add esxi host inventory plugin

changelogs/fragments/91-add-esxi_host-inventory.yml

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+---
+minor_changes:
+  - esxi_host - Added inventory plugin to gather info about ESXi hosts

plugins/doc_fragments/plugin_base_options.py

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+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2016, Charles Paul <[email protected]>
+# Copyright: (c) 2018, Ansible Project
+# Copyright: (c) 2019, Abhijeet Kasurde <[email protected]>
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
+class ModuleDocFragment(object):
+    # This document fragment serves as a partial base for all vmware plugins. It should be used in addition to the base fragment, vmware.vmware.base_options
+    # since that contains the actual argument descriptions and defaults. This just defines the environment variables since plugins have something
+    # like the module spec where that is usually done.
+    DOCUMENTATION = r'''
+options:
+  hostname:
+    env:
+      - name: VMWARE_HOST
+  username:
+    env:
+      - name: VMWARE_USER
+  password:
+    env:
+      - name: VMWARE_PASSWORD
+  validate_certs:
+    env:
+      - name: VMWARE_VALIDATE_CERTS
+  port:
+    env:
+      - name: VMWARE_PORT
+  proxy_host:
+    env:
+      - name: VMWARE_PROXY_HOST
+  proxy_port:
+    env:
+      - name: VMWARE_PROXY_PORT
+'''