VMware: vcenter_license fixes (#50794)

* Updated document fragment
* Used PyVmomi Helper class
* Added check for vcenter server

Fixes: #50752

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

lib/ansible/utils/module_docs_fragments/vmware.py

@@ -1,5 +1,6 @@
 # Copyright: (c) 2016, Charles Paul <cpaul@ansible.com>
 # Copyright: (c) 2018, Ansible Project
+# Copyright: (c) 2019, Abhijeet Kasurde <akasurde@redhat.com>
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 
@@ -44,3 +45,44 @@ options:
       default: 443
       version_added: 2.5
 '''
+
+    # This doc fragment is specific to vcenter modules like vcenter_license
+    VCENTER_DOCUMENTATION = '''
+options:
+    hostname:
+      description:
+      - The hostname or IP address of the vSphere vCenter server.
+      - If the value is not specified in the task, the value of environment variable C(VMWARE_HOST) will be used instead.
+      - Environment variable supported added in version 2.6.
+      type: str
+    username:
+      description:
+      - The username of the vSphere vCenter server.
+      - If the value is not specified in the task, the value of environment variable C(VMWARE_USER) will be used instead.
+      - Environment variable supported added in version 2.6.
+      type: str
+      aliases: [ admin, user ]
+    password:
+      description:
+      - The password of the vSphere vCenter server.
+      - If the value is not specified in the task, the value of environment variable C(VMWARE_PASSWORD) will be used instead.
+      - Environment variable supported added in version 2.6.
+      type: str
+      aliases: [ pass, pwd ]
+    validate_certs:
+      description:
+      - Allows connection when SSL certificates are not valid. Set to C(false) when certificates are not trusted.
+      - If the value is not specified in the task, the value of environment variable C(VMWARE_VALIDATE_CERTS) will be used instead.
+      - Environment variable supported added in version 2.6.
+      - If set to C(yes), please make sure Python >= 2.7.9 is installed on the given machine.
+      type: bool
+      default: 'yes'
+    port:
+      description:
+      - The port number of the vSphere vCenter server.
+      - If the value is not specified in the task, the value of environment variable C(VMWARE_PORT) will be used instead.
+      - Environment variable supported added in version 2.6.
+      type: int
+      default: 443
+      version_added: 2.5
+    '''